Free statistical Packages2

PAST -- an easy-to-use data analysis package aimed at paleontology including a large selection of common statistical, plotting and modelling functions: a spreadsheet-type data entry form, graphing, curve fitting, significance tests (F, t, permutation t, Chi-squared w. permutation test, Kolmogorov-Smirnov, Mann-Whitney, Shapiro-Wilk, Spearman's Rho and Kendall's Tau tests, correlation, covariance, contingency tables, one-way ANOVA, Kruskal-Wallis test), diversity and similarity indices & profiles, abundance model fitting, multivariate statistics, time series analysis, geometrical analysis, parsimony analysis (cladistics), and biostratigraphy.

AM -- a free package for analyzing data from complex samples, especially large-scale assessments, as well as non-assessment survey data. Has sophisticated stats, easy drag & drop interface, and integrated help system that explains the statistics as well as how to use the system. Can estimate models via marginal maximum likelihood (MML), which defines a probability distribution over the proficiency scale. Also analyzes "plausible values" used in programs like NAEP. Automatically provides appropriate standard errors for complex samples via Taylor-series approximation, jackknife & other replication techniques.

Instat Plus -- from the University of Reading, in the UK. (Not to be confused with Instat from GraphPad Software.) An interactive statistics package for Windows or DOS.

WinIDAMS -- from UNESCO -- for numerical information processing and statistical analysis. Provides data manipulation and validation facilities classical and advanced statistical techniques, including interactive construction of multidimensional tables, graphical exploration of data (3D scattergram spinning, etc.), time series analysis, and a large number of multivariate techniques.

SSP (Smith's Statistical Package) -- a simple, user-friendly package for Mac and Windows that can enter/edit/transform/import/export data, calculate basic summaries, prepare charts, evaluate distribution function probabilities, perform simulations, compare means & proportions, do ANOVA's, Chi Square tests, simple & multiple regressions.

Also, check out R and Ox, described in the Programming Languages section below.

Dataplot -- (Unix, Linux, PC-DOS, Windows) for scientific visualization, statistical analysis, and non-linear modeling. Has extensive mathematical and graphical capabilities. Closely integrated with the
NIST/SEMATECH Engineering Statistics Handbook.

WebStat -- A Java-based statistical computing environment for the World Wide Web. Needs a browser, but can be downloaded and run offline.

Regress+ -- A professional package (Macintosh only) for univariate mathematical modeling (equations and distributions). The most powerful software of its kind available anywhere, with state-of-the-art functionality and user-friendliness. Too many features to even begin to list here.

SISA -- Simple Interactive Statistical Analysis for PC (DOS) from Daan Uitenbroek. An excellent collection of individual DOS modules for several statistical calculations, including some analyses not readily available elsewhere.

Statistical Software by Paul W. Mielke Jr. -- a large collection of executable DOS programs (and Fortran source). Includes: Matrix occupancy, exact g-sample empirical coverage test, interactions of exact analyses, spectral decomposition analysis, exact mrbp (randomized block) analyses, exact multi-response permutation procedure, Fisher's Exact for cross-classfication and goodness-of-fit, Fisher's combined p-values (meta analysis), largest part's proportion, Pearson-Zelterman, Greenwood-Moran and Kendall-Sherman goodness-of-fit, runs tests, multivariate Hotelling's test, least-absolute-deviation regression, sequential permutation procedures, LAD regression, principal component analysis, matched pair permutation, r by c contingency tables, r-way contingency tables, and Jonkheere-Terpstra.

IRRISTAT -- for data management and basic statistical analysis of experimental data (Windows). Primarily for analysis of agricultural field trials, but many features can be used for analysis of data from other sources. Includes: Data management with a spreadsheet , Text editor, Analysis of variance, Regression, Genotype x environment interaction analysis, Quantitative trait analysis, Single site analysis, Pattern analysis, Graphics, Utilities for randomization and layout, general factorial EMS, and orthogonal polynomial.

SYSTAT 12 -- powerful statistical software ranging from the most elementary descriptive statistics to very advanced statistical methodology. Novices can work with its friendly and simple menu-dialog; statistically-savvy users can use its intuitive command language. Carry out very comprehensive analysis of univariate and multivariate data based on linear, general linear, and mixed linear models; carry out different types of robust regression analysis when your data are not suitable for conventional multiple regression analysis;compute partial least-squares regression;design experiments, carry out power analysis, do probability calculations on many distributions and fit them to data; perform matrix computations. Provides Time Series, Survival Analysis, Response Surface Optimization, Spatial Statistics, Test Item Analysis, Cluster Analysis, Classification and Regression Trees, Correspondence Analysis, Multidimensional Scaling, Conjoint Analysis, Quality Analysis, Path Analysis, etc. A 30-day evaluation version is available for free download.

Statlets -- a 100% Pure Java statistics program. Should run on any platform (PC, Mac, Unix) that supports Java. The free Academic Version is limited to 100 cases by 10 variables.

WINKS (Windows KWIKSTAT) -- a full-featured, easy-to-use stats package with statistics (means, standard deviations, medians, etc.), histograms, t-tests, correlation, chi-square, regression, nonparametrics, analysis of variance (ANOVA), probability, QC plots, cpk, graphs, life tables, time series, crosstabs, and more. Works on Windows XP (as well as Windows 2000, NT, 98, ME and 95.) Comes in Basic and Professional editions. Evaluation version available for download.

StudyResult -- (30-day free trial) General statistics package for: paired & unpaired t-test, one-way ANOVA, Fisher's exact , McNemar's, Chi2, Chi² homogeneity , life table & survival analysis, Wilcoxon rank-sum & signed-rank, sign test, bioequivalence testing, correlation & regression coefficient tests. Special features for interpreting summary data found in publications (p-values & conf. intervals from summary statistics, converts p-values to CI's & vice versa, what observed results are needed to get a significant result, estimates from publications needed for sample size calculations). Includes equivalence- and non-inferiority testing for most tests.

STATGRAPHICS Plus v5.0 (for Windows) -- over 250 statistical analyses: regression, probit, enhanced logistic, factor effects plots, automatic forecasting, matrix plots, outlier identification, general linear models (random and mixed), multiple regression with automatic Cochrane-Orcutt and Box-Cox procedures, Levene's, Friedman's, Dixon's and Grubb's tests, Durbin-Watson p-values and 1-variable bootstrap estimates, enhanced 3D charts. For Six Sigma work: gage linearity and accuracy analysis, multi-vari charts, life data regression for reliability analysis and accelerated life-testing, long-term and short-term capability assessment estimates. Two free downloads are available: full-function but limited-time(30 days), and unlimited-time but limited-function (no Save, no Print, not all analyses).

NCSS-2007 (Statistical Analysis System), PASS-2008 (Power and Sample Size, and GESS (Gene Expression software for Micro-arrays) for Windows. Free 7-day evaluation versions.

MiniTab -- a powerful, full-featured MS Windows package, with good coverage of industrial / quality control analyses. The free Version 12 Demo expires after 30 days.

InStat (Instant Statistics), a full-featured statistics package from GraphPad Software. Demo version disables printing, saving and exporting capabilities. Demo available for Windows only; commercial version available for Windows and Mac.

Prism -- from GraphPad Software. Performs basic biostatistics, fits curves and creates publication quality scientific graphs in one complete package (Mac and Windows). Windows demo is fully-functional for 30 days, then disables printing, saving and exporting; Mac demo always disables these functions.

CoStat 6.2 -- an easy-to-use program for data manipulation and statistical analysis, from CoHort Software. Use a spreadsheet with any number of columns and rows of data: floating point, integer, date, time, degrees, text, etc. Import ASCII, Excel, MatLab, S+, SAS, Genstat, Fortran, and others. Has ANOVA, multiple comparisons of means, correlation, descriptive statistics, analysis of frequency data, miscellaneous tests of hypotheses, nonparametric tests, regression (curve fitting), statistical tables, and utilities. Has an auto-recorder and macro programming language. Callable from the command line, batch files, shell scripts, pipes, and other programs; can be used as the statistics engine for web applications. Free time-limited demo available.