Statistical Procedures Sites

• A New Look at Composite Endpoints Gordon Guyatt's critique (read this)
• Anti-Coagulation Drugs Found to Have Different Effects in Diabetics After Heart Attack 2002
• Are Means Meaningless? The Application of Individual Responder Analysis to Analgesic Drug Development 2003 APS Bulletin
• Clinical Benefits, Decision Rules, and Multiple Inferences FDA This is an excellent source to understand use of composite endpoints
• Disease progression endpoints in hormone refractory prostate cancer: experience with the endothelin receptor antagonist, atrasentan
• Design strategies for improving trial efficiency 1999 International Clinical Trials Symposium
• Do multiple outcome measures require p-value adjustment? Ronald Feise, NIH 2002
• Is subjective global assessment a reliable measure of nutritional status in hemodialysis? 2004
• Multiplicity Challenges and Problems in the Design and Review of Controlled Clinical Trials Regulatory Experiences and Concerns FDA 9/22/2003 This is an excellent source to understand use of composite endpoints
• Problems in dealing with missing data and informative censoring in clinical trials Shih 2002
• Reviews/Evaluations: Review of FDA CDER Arthritis Advisory Committee Meeting: February 7-8, 2001 Topic: Celebrex and Vioxx
• Symposium : Statistical Issues Encountered in Clinical Trials Clinical Trials Center - University of Hong Kong

Confidence Intervals

• Confidence Intervals Measuringusability.com
• Confidence Interval Around a Completion Rate Measuringusability.com
• Exact Binomial and Poisson Confidence Intervals
• Generalizing to a Population
• Spreadsheet to Calculate Confidence Limits Thanks, Paul Ginns
• The Use of Predicted Confidence Intervals When Planning Experiments and the Misuse of Power When Interpreting Results Annal of Internal Medicine. Thanks, Marta García-Granero
• Trimmed Mean Confidence Limits Thanks, Marta Garcia-Granero-
• Understanding Confidence Intervals Albany.edu

Contingency Tables

• Contingency Tables Csbsju.edu
• Contingency Tables
• Contingency Tables with Sparsely Populated Cells
• Reading Tables
• Two-by-two Table Analysis

Data Analysis

• Applied Statistics Algorithms (CMU.EDU)
• Categorical Data Analysis
• Choosing the Correct Statistical Test (Thanks Paul Hover)
• Choosing a Significance Test
• Cochran test Thanks, Paul R. Swank
• Correlation Creative Research Systems
• Data Analysis Brief Book Excellent! Thanks, Robin Wolfson!
• Decision Trees Dtreg.com
• Differences between percentages and paired alternatives Thanks, Marta Garcia-Granero
• Effect Size (Cohen's D) UCCS.EDU Thanks, Statmanz - William M. Bailey
• Income distribution in Current NHANES University of Munich
• Intuitive Biostatistics: Choosing a statistical test (Thanks Paul Hover)
• Master Tools (Shodor.Org) - Simulations
• Measuring Usability
• One and two sided tests of significance BMJ. Thanks Marta García-Granero
• Pitfalls of Data Analysis
• Post-hoc Power Thanks Marta García-Granero
• Post-hoc Power - Don't Do It! Thanks Marta García-Granero
• Process Capability Analysis
• Relative and Absolute Statistical Comparisons
• Rules for Cheaters: How to Get a High R2
• Statistical Data Analysis: Prove It with Data
• Statistical Significance Creative Research Systems
• SurfStat Australia
• Tables for Statistical Significance With Multiple Comparisons
• The Data Analysis BriefBook
• The Median Isn't the Message Jay Gould
• When Can Odd Ratios Mislead BMJ article

Data Collection

• Database Tutorial
• CDC/NCHS'Public Health Data: The Silent Partner - Self-Study

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Data Management

• Statistical Reporting 101

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Data Presentation

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Factor Analysis

• Exploratory Factor Analysis Thanks, Marta García-Granero
• Factor Analysis North Carolina State University - Dr. Garson. Thanks, Ed Tesiny
• Using SPSS

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Fisher Exact

• Fisher Exact
• Fisher Exact Test Csbsju.edu

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Forecasting

• Forecasting: For Researchers
• For Practitioners of Forecasting
• How to Select a Forecasting Method
• Long-Range Forecasting
• Sources of Forecasts for Practitioners
• Speculations of Seasonal Factors

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Item Analysis

• How to use the Toolkit Template to TABULATE, conduct the ITEM ANALYSIS and SCORE
• Internet Application
• Item Analysis (Cudenver)
• Item Analysis - Explanations
• ITEMAL
• MEC Item Analysis
• Reliability and Item Analysis
• Test Item Analysis
• The Item Analysis

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Kolmogorov-Smirnov Test

• Kolmogorov-Smirnov Test Csbsju.edu

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Likert Scale

• Analyzing Data Measured by Individual Likert-type Items Thanks, Bob Schacht
• Can Likert scales be considered interval? Thanks, Bob Schacht
• Scales and Standard Measures Thanks, Bob Schacht
• Statistics on Likert Scale Surveys Thanks, Bob Schacht

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Margin of Error

• Best Estimates
• Sampling Error
• Serious Statistical Secrets

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Meta Analysis

• Averaging Dependent Effect Sizes in Meta-Analysis Thanks, Marta García-Granero
• Bias in meta-analysis detected by a simple, graphical test BMJ. Thanks, Marta
• Empirical assessment of effect of publication bias on meta-analyses BMJ. Thanks, Marta
• Growing pains of meta-analysis BMJ. Thanks, Marta
• Measuring inconsistency in meta-analyses BMJ. Thanks, Marta
• Meta-Analysis Overview Richard Tweedie. Thanks, Marta García-Granero
• Meta - Analysis: Methods of Accumulating Results Across Research Domains
• Meta-analysis: Beyond the grand mean? BMJ. Thanks, Marta
• Meta-Analysis Notes Jamie DeCosta. Thanks, Marta
• Meta-analysis: Potentials and promise BMJ. Thanks, Marta
• Meta-analysis: Principles and procedures BMJ. Thanks, Marta
• Meta-Analysis Software BMJ. Thanks, Marta
• Meta-analysis Spurious precision? Meta-analysis of observational studies BMJ. Thanks, Marta
• Misleading meta-analysis BMJ. Thanks, Marta
• MIX - Meta-analysis with Interactive eXplanations Free Excel program
• Proportional Odds Ratio Model for Comparison of Diagnostic Tests in Meta Analysis Thanks, Marta
• Quantitative Synthesis in Systematic Reviews Annals of Internal Medicine. Thanks, Marta
• Systematic Reviews: Identifying relevant studies for systematic reviews BMJ. Thanks, Marta
• Systematic reviews in health care. Investigating and dealing with publication and other biases in meta-analysis BMJ. Thanks, Marta
• Systematic Reviews: Meta-analysis and its problems BMJ. Thanks, Marta
• Systematic Review: Why sources of heterogeneity in metaanalysis should be investigated BMJ. Thanks, Marta
• The relation between treatment benefit and underlying risk in meta-analysis BMJ. Thanks, Marta

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Observed to Expected Ratio

• METHOD OF CALCULATING OBSERVED TO EXPECTED RATIO AS A MEASURE OF STRENGTH OF ASSOCIATION
• FURTHER EXAMPLES OF RATIO OF OBSERVED TO EXPECTED JOINT FREQUENCIES TABLES

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Online Textbooks/Tutorials

• A New View of Statistics
• Electronic Textbook Statsoft.Com
• Introduction to Probability
• National Library of Medicine's Finding and Using Health Statistics: A Self-Study Course
• Online Statistics Tutorials (Texasoft.com) (Thanks Marta Garcia-Granero)
• The Little Handbook of Statistical Practice
• Statnotes: An Online Textbook, by G. David Garson
• Statsoft Electronic Textbook

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Other Procedures

• Binomial Test
• Bootstrap Methods & Permutation Tests Thanks, Tom Metzler
• Calculate the Median from Group Data University of Alberta
• Correspondence Analysis Ncsu.edu Thanks, A.J. van der Kooij
• Correlation
• Derivation versus validation BMJournals. Thanks, Marta
• D Statistic
• Measures of Poverty
• Months Between Function Thanks Vicent Giner
• Pairwise Analysis
• Parallel Analysis and Velicer's MAP Test Thanks Marta García-Granero
• Poisson Distribution
• Random Numbers Generator Thanks,Kathryn Gardner
• Significance Testing
• SMR Analysis
• The magnificent ROC (Receiver Operating Characteristic curve)
• What's An Odds Ratio? Thanks, Paul Dickson
• What Does the Population Attributable Fraction Mean? CDC's Preventing Chronic Disease

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Percentages

• Comparing Rates and Percentages
• Converting Percentages to Fractions
• Differences Between Percentages and Paired Alternatives
• Fractions,Decimals and Percentages
• Math Help - Percentages
• Modeling Percentages
• Percentage Increase/Decrease Mathforum.org
• Percentage of Decrease Mathforum.org
• Percent Change, Increase, Difference Mathforum.org
• Percents, Decimals, Fractions Review Purplemath.com
• QuikMath Automatic Math Solutions - Percentages This is cool!
• The Percentages Calculator
• The Quest for Accurate Numbers

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Ranking

• Mann-Whitney test is not just a test of medians: differences in spread can be important BMJ Journals. Thanks, Marta García-Granero
• Rank Score Tests BMJ Journals. Thanks, Marta García-Granero

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Rater Agreement

• Binary Data Factor Analysis and Multidimensional Latent Trait/Item Response Theory (IRT) Models Thanks Jude Cosgrove
• Inter-rater Reliability (JCAHO)
• Latent Trait Models for Rater Agreement
• McNemar Tests of Marginal Homogeneity
• Observer Agreement
• Odds Ratio and Yule's Q
• Statistical Methods for Rater Agreement

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Regression Analysis

• Apply Regression Blog
• Conditional Logit Regression Thanks, Michael Healy
• Discriminant Function Analysis Thanks, Marta García-Granero
• Fitting a Line to (x,y) Data
• Least Squares Fitting (Regression) Csbsju.edu
• Logistic Regression
• Logistic regression and discriminant analysis (University of Exeter) Thanks Frank Thomas
• Log-Linear, Logit, and Probit Models Thanks, Marta García-Granero
• Multinomial Conditional Logistic Regression Thanks, Anthony Babinec
• Nonlinear Regressionnlreg.com

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ROC Analysis

• ROC Analysis Thanks, Mike Lieber

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Sample Size Information

• Animal carcinogen sample size calculator Thanks, John Cook
• Children's Mercy Hospitals & Clinics - Stats Query & Answers
• Determining Sample Size (the formulas)
• Determining Sample Size (Six Sigma)
• How To Determine Sample Size, Determining Sample Size iSixsigma
• Microarray sample size calculator Thanks, John Cook
• Open Epi Version 2 Open Source Epidemiologic Statistics for Public Health
• PS: Power & Sample Size Calculation
• Sample Size Determination
• Sample Size On-line Calculators
• Some Practical Guidelines for Effective Sample Size Determination Thanks, Marta García-Granero
• Statistical Power, Sample Size, and Their Reporting in Randomized Controlled Trials
• Two Sample Size Practices That I Don't Recommend Thanks, Marta García-Granero

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Standard Errors

• How to Calculate Standard Errors Runet.edu
• Relative Standard Error (CDC definition) Thanks Arthur Kendall
• Standard Errors Explanations
• Standard Error Bars - an Explanation Runet.edu
• Standard Error: Statistician's Edge

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Standardized Mortality Ratio

• Monitoring changes in hospital standardised mortality ratios BMJ
• Standardized Mortality Ratio PA Health Department

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Statistical Reference Sites

• Abuses, Misuses, and In-excuses for QC Problems with "Westgard Rules"
• ACP's Effective Clinical Practice - Statistical Primers - Don't miss this one! Reprints of their series on statistical topics. The best!!!!
• Advanced Quantitative Methods (Cudenver)
• Basic Statistics for Cancer Incidence
• GraphPad.Com's InStat Help
• How to Read a Paper
• Petitti's Book - A Review
• Resampling: The New Statistics
• Simpsons's Paradox - When Big Data Sets Go Bad Thanks Jeremy Miles
• Statistical On-line Calculators
• Statistical Programs
• StatPrimer, Verson 4
• STATS - STeve's Attempt to Teach Statistics (Thanks Marta Garcia-Granero)
• Supercourse - Newest Courses on the Web
• Survival Curves
• The Prism Guide to Interpreting Results
• University of Pittsburgh's Supercourse

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Statistical Reporting

• Best Practices for "Westgard Rules"
• Restoring Confidence in Usability Results
• Statistical Guide for Authors
• Statistical Reporting 101
• Usable Statistics Measuringusability.com

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Student's t-test

• Student's t-Test Starting Point
• Student's t-Tests Csbsju.edu
• t-Test

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Survey Research

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Survival Analysis

• Kaplan-Meier Survival Analysis Thanks,Marta García-Granero
• Survival Analysis Kaplan-Meier. Thanks, Marta García-Granero
• Survival probabilities (the Kaplan-Meier method)

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Web Resources

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Site Search Engine and Site Index

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