HEATKEYS

Web site for statistical computation; probability; linear correlation and regression; chi-square; t-procedures; t-tests; analysis of variance; ANOVA; analysis of covariance; ANCOVA; parametric; nonparametric; binomial; normal distribution; Poisson di...

MedCalc statistical software for biomedical research, including ROC curve analysis, method comparison and quality control tools. Free trial available.

Step-by-step SPSS tutorials with screenshots explaining how to perfrom basic, intermediate and advanced statistical tests in SPSS as well as comprehensive statistical guides.

Statistical resources for social scientists, including Z-test, Chi-square & T-test statistical calculators.

An R introduction to statistics that explains basic R concepts and illustrates with statistics textbook homework exercises.

GraphPad Prism is a powerful combination of biostatistics, curve fitting (nonlinear regression) and scientific graphing in one comprehensive program. Easily organize, analyze and graph repeated experiments; pick appropriate statistical tests and inte...

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

OriginLab produces professional graphing and data analysis software for scientists and engineers. Our products are designed to be easy-to-use, yet have the power and versatility to provide for the most demanding user.

Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.