Useful Statistics Resources

Sadly, our visitors sometimes need more than we provide at Stat Trek. To fill in the gaps, we are pleased to list some very good resources below.

Statistics Help

TalkStats.com. Are you looking for help with probability or statistics? Or do you want to help others with their statistics questions? Then, this helpful, friendly forum is the place for you.
Math Help Forum. Free online help community where you can post questions on any math topic. Includes discussion threads on basic and advanced statistics and probability.
Stat-Help.com. Free statistics help. Questions are usually answered within several days. These volunteers only help folks with real-world data analysis; they don't do homework problems.

HyperStat Online Statistics Textbook. In addition to an introductory statistics textbook, this site includes analysis tools, instructional demos, and exercises with answers to selected problems.
Khan Academy. Learn statistics and probability — everything you'd want to know about descriptive and inferential statistics. Clear, easy-to-understand videos, practice problems with solutions, and AI-powered support.

CougarStats. CougarStats allows users to upload raw or summarized data (via CSV, Excel, or manual entry) and perform descriptive statistics (means, variances, quartiles, boxplots etc.), work with a variety of probability distributions (binomial, Poisson, normal and more), estimate sample sizes, conduct statistical inference (confidence intervals, hypothesis testing for one/two/multiple samples, categorical data tests), and perform regression and correlation analyses (including simple, multiple, and logistic regression) — all via a user-friendly graphical interface.

Free Statistics Calculators A large collection (100+ calculators) organized by category: distributions, confidence intervals, ANOVA, regression, correlation, etc. Good for lots of quick specialized tasks (e.g., p-value for a given statistic, binomial probability, etc) when you know the test you want and just want quick numbers.

Statistics Kingdom Provides calculators that check assumptions, output effect sizes, test power, and also include tutorials (e.g., “Which test should I use?”) and is quite user‐friendly. Automatically checks assumptions, interprets results and outputs graphs, histograms and other charts.

Statistical Calculations Made Easy Choose the right statistical test for your data. Interactive selector helps you find the appropriate test based on your research question and data characteristics, or browse the comprehensive table of tests with their assumptions and formulas. Create clear, effective visual representations (e.g., bar charts, pie charts, histograms, box plots) of your data.

Social Science Statistics As the name implies, this resource is geared towards tests common in psychology, sociology, and other social sciences. The calculators are clean, simple, and cover t-tests, ANOVA, chi-square, correlation, and regression. It also has helpful tools for calculating p-values from test statistics.

Free Statistics and Forecasting Software An incredibly powerful and free collection of statistical software. It can perform very advanced analyses, including time series analysis, multivariate statistics, and extensive regression modeling. The interface can be a bit dense, but its capabilities are immense.