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Articles:
A Quick Guide for Choosing the Appropriate Statistical Test
by Victoria Briones, Ph.D
My Sample is Too Small, Now What?
by Raymond D. Mooring, Ph.D
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Statistics and Data Analysis
Statistics Consultants
Dr. Victoria Briones graduated with a Ph.D. in Organizational Psychology from Columbia University. While completing her graduate studies, she taught applied regression analysis to graduate students in education and psychology. Students enjoyed her regression course because she was able to translate complex statistical concepts into a language that the "stats phobic" students could easily understand. Victoria was also an assistant lecturer in research methods (and received the highest mean evaluation for teaching performance). After graduating, she was a research vellow at Harvard University's Kennedy School of Government. As a fellow, she conducted statistical analyses and wrote articles on negotiation behavior and conflict resolution with her former dissertation adviser. In the last two years, Victoria has worked as a statistical consultant, helping graduate students in psychology, education, nursing, biology, and business hone their study hypotheses, arrive at better operational definitions of their study variables, and improve procedures to increase the internal and/or external validity of their study. She also performed general statistical procedures such as reliability analyses, non-parametric tests (e.g., Mann-Whitney, Kruskal-Wallis, and chi-square tests), t-tests, analysis of variance (ANOVA), analysis of covariance (ANCOVA), exploratory factor analysis (EFA), and linear regression. Further, she conducted multivariate tests such as multivariate analysis of variance (MANOVA), logistic regression, and structural equation modeling (SEM; using AMOS, LISREL, and EQS). Victoria also created summary tables and graphs of statistical findings and helped students interpret their study results. More importantly, she enjoyed explaining basic statistical procedures and findings to clients who had a limited understanding of such concepts. Scope: research methods, reliability analyses, t-tests, ANOVA, repeated-measures ANOVA, ANCOVA, exploratory and confirmatory factor analyses, multiple linear regression, logistic regression, MANOVA, structural equation modeling (AMOS, LISREL, and EQS) |
Feedback: "Victoria was very professional and prompt in her service delivery. She had a command of the updated literature. I was very comfortable that she knew the current trends in the statistics I needed to use for my dissertation. She was extremely thorough and answered all of my questions in language I could comprehend. I would recommend Victoria to any graduate students who need help with advanced statistics for their projects." —(Contact information on request) "Service received: Dissertation Statistical Analysis. I found the timely completion of analyses and quick responses to my questions to be most valuable. I was amazed at how quickly the project was completed. The consultant was also very willing to answer my detailed questions and provide me with additional copies of the output files." —Student, Indiana University of PA (contact information on request) "She was wonderful. I was having difficulty putting all the information together and she just cleared things up for me. My stress level has definitely gotten better!" —Jonda Hennosy |
Hanna Craig, Ph.D., M.S., B.S., is a medical writer and editor with 20 years of writing and research experience in numerous scientific fields. She holds post-graduate degrees in systematics and molecular toxicology, as well as post-doctoral fellowships in neuroendocrinology and bioinformatics. She writes, edits and proofreads technical reports, scientific manuscripts, grant proposals, materials for CME accreditation and clinical study reports (CSR) for pharmaceutical industry. She has authored numerous highly technical publications and grant proposals, in many biological fields and with an emphasis on biotechnology. On these grants she has served both as co- and principle investigator. Additional experience includes computational biology, scientific advisory, database curation and annotation, web content writing, patent application writing and statistical design and analysis. Her general areas of interest include: bioinformatics, molecular biology studies, virology, vaccinology, cardiovascular disease, diabetes, neurology, oncology, toxicology and pharmacology. Hanna has served on graduate student committees, and has advised and assisted graduate students with dissertations and academic publications. She has also served on scientific advisory boards to assist in bioinformatics design and tool development, and has her own bioinformatics software development business. She has published book chapters, has authored and co-authored many peer-reviewed scientific articles, as well as other works on medical and scientific websites. |
Feedback: Have you worked with Hanna Craig, Ph.D., M.S., B.S.? Please send feedback to the network coordinator |
Dr. Emil Freeman is an experienced statistician and polymer scientist/engineer. As an internal consultant for a major rubber company he helped many associates solve R&D and quality assurance problems by identifying their root cause. As a statistician in the pharmaceutical industry he analyzed stability studies to predict shelf lives, designed and analyzed studies of biological, chemical and manufacturing processes, and solved problems for quality control statisticians faced with "unusual situations". His independent consulting assignments have covered a wide range: promotional games, tire life studies, agricultural experiments, electronic signals. He is an expert at designing experiments to fit each customer's needs: fractional factorials, composite designs, incomplete block designs, Youden Squares, etc. He is an expert in Multiple Criteria Optimization and analyzing "messy data" (multiple error terms, mixed models, components of variation, regression, ANOVA, ANOCOVA). He is an expert user of JMP software, and was a beta-tester and contract JMP instructor for the SAS Institute. He has mentored and tutored a wide range of individuals, from children and adolescents with learning disabilities to non-statistician scientists and engineers. He loves to hear the magic words, "This isn't as hard as I thought it would be." He has published eight peer-reviewed papers and has four US patents. He holds a BS from MIT, a PhD and MA from Princeton University, and an MS from Case Western Reserve University. |
Feedback: Appraisals said, "...recognized and much-sought internal consultant and expert in statistical methods and their application to real problem solving.... Excellent listener and dissector of the key needs/wishes of his customers.... Focuses their work to answer their desired questions, and creates experimental approaches specific to each problem." |
Tom Granoff, Ph.D., has spent over 25 years designing surveys and questionnaires, doing data analysis using SPSS, and writing up the results for hundreds of thesis and dissertation projects in most of the behavioral sciences. Tom often edits the Methodology Chapter to ensure the research questions, each hypothesis, the data gathered, and the statistical analysis approach are all in agreement. He worked on over 100 separate projects in the past 12 months. Frequent majors Tom works with include psychology, counseling, education, public health, leadership, business, marketing, sociology, management, and nursing. he also worked for many years in marketing research and data processing positions in the health care industry. A popular instructor, Dr. Granoff teaches graduate-level research methods and statistics courses at Loyola Marymount University and Pepperdine University, both in Los Angeles. He prides himself in being able to explain most multivariate statistical tests in simple English without using math. Clients also frequently ask Tom to help them prepare for their final orals. His formal education includes a Ph.D. in Clinical Psychology plus Master's degrees in Theology and Industrial/Organizational Psychology. Scope: multivariate statistics, behavioral sciences, data processing, marketing research, forensic psychology, research design, SPSS, survey research, medical research, web-based surveys, quantitative methods, focus groups, interviewing, qualitative methods, correlation, research methodology, ANOVA, MANOVA, logistic regression, multiple regression, discriminant function analysis, factor analysis, methodology chapter editing, final oral examination preparation. |
Feedback: "I passed with flying colors. Thanks for those outstanding statistical tables and the assistance in the chapter on findings. I appeared to know more about statistics then the committee after your explanations." Dr. Charlotte "I am so impressed by Dr. Granoff's kindness and professionalism. ... he was always timely and consistent in returning the work. He has the highest ethical standards of anyone I have worked with. I would not have made it through without him" Dr. Michelle "Tom was a wonderful support and guided me step by step through the statistical portion of my dissertation. I was always very pleased with how quickly Tom would answer my questions and how fast he was able to give me my statistical information." Jean "I can't even begin to convey my gratitude for his outstanding work. The bottom line is I HIGHLY recommend his service, for he gets the job done!" Rebecca
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Ronald B. Marks, PhD was a marketing professor, now retired from the University of Wisconsin. He received his Ph.D. from the University of Missouri - Columbia, with a major in Marketing and minor in statistics. During his thirty year career, he taught undergraduate and graduate market research and multivariate statistics amongst other courses. He made extensive usage of SPSS, Minitab, and LISREL in both teaching and research. His research credentials in the use of multivariate statistics are evidenced in articles, such as: "A Structural Equation Model of Predictors for Effective Online Learning," Journal of Management Education, 29 (4), August, 2005 and "Psychometric Evaluation of the ADAPTS Scale," Journal of Personal Selling and Sales Management, Vol. XVI (4) (Fall, 1996, 53-56) He attended seminars in "Multivariate Statistics" at the University of Colorado and "General Structural Equation ("Lisrel") Models," (Introduction and Advanced) at the Inter University Consortium for Political and Social Research, University of Michigan, Ann Arbor. He also conducted similar faculty seminars in Multivariate Statistics at the University of Wisconsin. In counseling dissertation students and business clients, his experience is that "a problem well defined is half solved." Or as Tom Peters suggested in his best-selling book on management, "if you don't know where you are going, you are likely to end up somewhere else." That is, no matter how arcane the statistics employed, they will never compensate for poorly stated hypotheses and literature review. Hence, when consulting with students, he helps them first develop lucid, operational hypotheses and then determines which statistical methods to use, rather than the converse. Scope: multivariate statistics, behavioral sciences, marketing research, research design, SPSS, Minitab, structural equation modeling (LISREL), survey research, web-based surveys, quantitative methods, correlation, ANOVA, MANOVA, multiple regression, discriminant analysis, factor analysis, methodology chapter editing, nonparametric tests (such as chi-square or Mann-Whitney U Test), statistical application to social science data (e.g. psychology, sociology, economics) and business data (e.g. finance, business, and marketing), can aid with set-up of data files, analysis of sample characteristics, can also help develop persuasive Power Point presentations for oral defenses or business presentations. |
Feedback: "The network was very easy to use. Dr. Marks was very helpful and very cooperative. I was able to reach him easily by phone and e-mail. My work was returned to me on time. The services I received saved me time and stress. Overall, I was very satisfied with the quality of the services I received, and I strongly recommend Dr. Marks to others who need assistance with statistics and data analysis." —Jamil Shahidullah "Using Ron was the best decision we made about our graduate research project. While we knew the field of anesthesia, none of us were statisticians and we struggled greatly in making sense of our data. Ron simplified everything and had most of our questions answered within 48 hours of our initial request. Excellent service and quality." —(Contact info upon request) |
Dr. Chad Martin received his doctoral degree in Healthcare Management from Tulane University, School of Public Health and Tropical Medicine. His master's degree is in Exercise Physiology and Management. He is also a Registered Exercise Physiologist with the American College of Sports Medicine. Dr. Martin has worked in healthcare for the last 15 years. As a biostatistician he conducts many types of analyses, such as performance improvement, market share, clinical quality, and staffing effectiveness. Further, he serves as the biostatistician for the Cardiac and Pulmonary Rehabilitation Association in NC. He has taught online for several universities in their respective undergraduate and graduate degree programs in Healthcare Management. As a subject matter expert, he has helped universities with course design for healthcare finance, quality, and outcomes research/classes. He has served on doctoral dissertation committees and chaired three. He also has a great deal of experience and interest in cardiac and pulmonary rehabilitation research. He has recently published several new studies in the cardiac and pulmonary area (July/August 2008 issue of the Journal of Cardiac and Pulmonary Rehabilitation). He is also interested in Medicare and Medicaid data mining, predictive modeling, and secondary data analysis. During the data gathering phase:
During the data analysis phase:
During the thesis or dissertation defense preparation phase:
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Feedback: Have you worked with Dr. Chad Martin? Please send feedback to the network coordinator |
Dr. William Nasby received his Ph.D. in Personality and Development/Applied Multivariate Statistics from Harvard University in 1980 and his B.A. in Psychology from Brown University in 1975. His expertise in applied multivariate statistics spans numerous techniques, including (but not confined to) multivariate analysis of variance and covariance, the multivariate approach to analyzing repeated-measures designs, discriminant function analysis, multivariate multiple linear regression, canonical correlation analysis, principal components analysis, factor analysis, dynamic factor analysis, cluster analysis, multidimensional scaling, and time-series analysis. With over 20 years of experience as a professor, first at a major university and then at a doctoral program in clinical psychology (APA-accredited), Dr. Nasby received numerous awards for excellence and innovation both in teaching and in research. His teaching awards include courses in Research Methodology, Introduction to Statistics, Intermediate Statistics, Multivariate Statistics, and Alternative Methodologies. |
Feedback: Have you worked with Dr. William Nasby? Please send feedback to the network coordinator |
Educational Psychology Advisor Elizabeth L. Pearman, Ph.D. has spent more than 17 years designing surveys, analyzing data using SAS and SPSS, programming SAS and SPSS, developing assessments for unique situations, research design, developing sampling frames, calculating sample size, program evaluation, qualitative design, and qualitative analysis. Along with being an independent consultant in program evaluation, she teaches graduate classes Master's and Doctoral level research methods, qualitative methods, program evaluation, statistical programming, and lifespan development at the University of Northern Colorado for the Department of Applied Statistics and Research Methods and the Department of Educational Psychology. Elizabeth has completed over 40 program evaluations for clients, made more than 40 presentations at national conferences, published articles in several different fields, and authored three books. She has served on 25 dissertation committees and has consulted with another 40+ doctoral students on design, statistics, statistical programming, conceptualization, and writing in fields diverse as: sports administration, special education, educational leadership, human rehabilitation, educational psychology, applied statistics, school psychology, music education, chemistry education, biology education, instructional technology, psychology, reading, early childhood, and others. Her formal education includes a B.M. from the University of Missouri at Kansas City, an M.A. and Ph.D. from the University of Northern Colorado in Educational Psychology specializing in research methods, measurement/assessment, program evaluation and statistics. Betsy can help you with all phases of your dissertation/thesis from conceptualizing the dissertation/thesis, use of qualitative methods, qualitative design, qualitative analysis or quantitative methods. Her statistical skills are extensive (descriptive, inferential, multivariate, regression analysis, factor and cluster analysis, and reliability and validity, etc.) along with expertise in survey/questionnaire design and development, methodology chapter editing, sampling techniques and sample size calculation, proposal development, defense preparation, web-based surveys, data entry, data editing, statistical programming, measurement/ assessment, data interpretation and understanding, experimental and quasi-experimental design, Internal Review Board applications, informed consent forms. She can make statistics understandable, will help you develop and edit your methodology chapter, assist you in understanding your data, help you with formulating your research questions, and guide you from the conceptualization of your dissertation/thesis to the defense so you will learn and understand your data, results, and study. |
Feedback: "Betsy, I wanted to thank you again for your help on the data analysis of my dissertation. Everything went well and I was able to complete, defend my dissertation successfully and graduate in December. Your help was essential in getting me going again to achieve this goal. Thanks again and have a Happy New Year!" —(Contact info on request) "Thanks for the help in data analysis. I could not have completed the study without your guidance. Data analysis made the difference because I was able to extract meaning from the text. The meaning extracted from the text was the strength of the dissertation and the strength of my defense presentation. —(Contact info on request) "... after my wife and children, you come in a close second. Below are my acknowledgements and while you're listed after my committee (I felt compelled to put them at the top) you are truly the most important contributor to my work. While the statistics were a component, your help with the survey instrument leading up to the statistics really helped me bridge a gap and work toward closure. Without the instrument and the associated statistics I would have been lost and at a time when I didn't know what to do, you gave me guidance. It may not even be anything you remember but your effort on the survey really set me on the right path. For that I thank you!" —(Contact info on request) |
| Dr. Jane Scott approaches statistics with the same motto that she uses in life: "Keep it simple and have fun with it!" Jane received her Ph.D. in Quantitative Psychology with an emphasis on personality psychology from the University of California. She teaches statistics for psychology at S. Pacific university, where they let her wear shorts and teach barefoot. Her students often leave her class amazed that they have come to like a subject of which they were initially frightened. Jane can help you analyze your data and interpret the results using SAS, SPSS, or Minitab. She can help you understand, implement, and interpret statistical procedures such as t-tests (single-sample t-test, independent t-test, dependent or paired t-test), ANOVAs (one-way ANOVA, two-way ANOVA, repeated measures ANOVA, mixed ANOVA, MANOVA), correlation, chi-square, multivariate procedures (multiple regression, logistic regression, factor analysis, principal component analysis or PCA), and survival analysis, among others. She can also provide simple explanations for such statistical concepts as variance, standard deviation, z-scores and the normal distribution, the central limit theorem, type-I and type-II errors (alpha and beta), power, effect size, R-squared or the coefficient of determination, and the Pearson Product Moment Correlation Coefficient, as well as concepts from psychometrics such as reliability and validity. Jane received her bachelor's degree in English from the University of California, Berkeley, so she spent her undergraduate years developing her writing and communication skills which enable her to communicate mathematical concepts clearly. She loves to help students hone their methodology chapters, formulate clear hypotheses, and clearly articulate the appropriate analyses for testing each hypothesis. An animated teacher and public speaker, Jane can also help you develop effective PowerPoint presentations for classes or oral defenses. Scope: psychology and statistics, statistics methods, quantitative psychology, statistics for psychology, SAS statistics, Minitab 15, structural equation models, quantitative methods research, minitab analysis, psychometrics, psychology statistical tests, personality social psychology. |
Feedback: "Jane ... was simply wonderful ... I do not have a deep understanding of statistics and what tests to use when. I am so thankful to have found this service! The time saved is worth every penny. My kids are ready to have Mommy off the computer!" — Contact information on request "Jane ... was incredibly patient, helpful, and amazingly quick to respond and perform services. I was drowning in data and not sure which way to go ... within one week my results chapter of my dissertation was complete. I could have never done it so quickly without her help." — Contact information on request "Dr. Scott understood my project and what type of statistical analysis was best for my particular research. I was very grateful to have found her and was very relieved that she assisted me with this part of my research project. I am 100% satisfied with both the web site and services I received." — (Contact information on request) |
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Advanced Engineering Mathematics At Boeing, she designed, integrated, and tested various systems design. She also communicated extensively with multiple engineering and manufacturing organizations, airline customers, and global suppliers. As a consulting engineer, she designed Heating, Ventilating, and Air Conditioning (HVAC) systems for commercial buildings and was responsible for documenting the design specifications for those systems. Elana also offers a technical editing course, for those currently working or studying in technical fields. This course varies between three and seven days in length to meet the client's specific needs and can be taken either in Seattle or at your work place for a group of employees. The course covers the necessary skills of the technical editor and it is primarily focused towards the needs of engineers and technical staff, who are seeking to improve their technical editing skills in their daily workplace. It includes an overview of the editing process; reviews of grammar, punctuation, and spelling for technical editors; steps for improving technical writing style; and key strategies for enhancing the overall quality of technical communications. Elana completed the Technical Writing and Editing Certificate Program at the University of Washington in 2001. As a freelance technical writer and editor, and project manager Elana can help you improve or write your technical documents in the following areas:
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Feedback: "Elana really took charge of a challenging project; the creation of a custom-published magazine about careers for the Department of Labor called "In Demand." Elana edited three issues--careers in advanced manufacturing, careers in science and technology, and careers in biotechnology. She scouted out the story ideas and found and guided freelancers developing the stories. She also worked with graphic designers to create the look of the magazine for a very demanding client. Throughout, Elana demonstrated intelligence and attention to detail. And she was calm and cheerful even during tense moments on deadline. I give her a high recommendation!" Jan Tuchman, Editor-in-Chief, Engineering News-Record, The McGraw Hill Companies "It is rare to find a combination of skills such as Elana's. Her engineering expertise along with her technical writing and editing skills has been a great asset for us." Michael S. "I am so glad that I used your services. Your turnaround time was fast so I was able to submit my thesis on time. I will definitely recommend your service to other students. Thank you for everything! You are the best!" Ella Chan, Graduate student at NYU |
Dr. Jan Visser earned his Ph.D. in psychology in 1998. He worked as an assistant professor and currently combines teaching with a career as a fiction author. Jan has published twelve academic texts and two fiction novels. His scholarly writing is clear, concise, and to the point, while his creative writing can be described as passionate and engaging. Jan has extensive experience guiding students through the process of writing their thesis or dissertation. He consistently receives excellent evaluations from his students, who praise his commitment and the quality of his feedback. Jan will help you design your research and write your thesis or dissertation. He can also give general advice on the use of statistics. His strengths include: 1. A thorough knowledge of research design and statistics, including t-tests, ANOVA, MANOVA, regression analysis, factor analysis, and cluster analysis—he can help you determine what type of analysis you should use for your particular research question. 2. A talent for spotting weaknesses in the design of a study—if you're still in the early stages of your research, he can help you improve your design and put you on the right track. 3. A knack for presenting complex material in easily accessible prose—he will not write your thesis or dissertation for you, but he will assist you in creating a well-written, comprehensible text. 4. Attention to detail—although Jan does not do copy-editing, he will point out errors in spelling and grammar, as part of his writing assistance. 5. A quick turnaround time—you'll have your stuff back before you can say floccinaucinihilipilification (this is a word, believe it or not). |
Feedback: Have you worked with Dr. Jan Visser? Please send feedback to the network coordinator |
E.L. Zurbriggen has provided statistical consulting for numerous master's and Ph.D. theses, has taught doctoral-level statistics courses for the past 7 years and has presented statistical workshops at national conferences. She received a Ph.D. in Personality Psychology from the University of Michigan, and subsequently completed an advanced post-doctoral fellowship in probability, statistics, methodology, and quantitative techniques at New York University. Her areas of advanced expertise include analysis of variance (including ANOVA, MANOVA, ANCOVA), multiple regression, logistic regression, exploratory and confirmatory factor analysis, and structural equation modeling (SEM, using software packages such as LISREL, AMOS, and EQS). Her goals when consulting are threefold: to communicate the basics of the techniques as clearly as possible, to encourage the use of statistics as one part of a larger argument, and to promote student/client empowerment through mastery of (rather than robotic application of) statistical techniques. |
Feedback: "Dr. Zurbriggen helped me navigate through the maze of possibilities and zero in on the statistics needed for my dissertation. I never felt spoken 'down to' nor did she ever talk above me. I would highly recommend Dr. Zurbriggen." (contact info on request) "Dr. Zurbriggen guided me from start to finish with professionalism, sensitive understanding (regarding my lack of skills), finesse (with statistical methods/analyses), and support (by providing encouragement and direction). I consider it a great stroke of luck to have been assisted by such a wonderful statistician" Tim Hoff, school counselor |