ReliCheck -- an online reliability analysis tool that allows users to check the reliability of the scores on their survey. The free option provides reliability score, statistical strength of survey, general item analysis, and a statistical summary of the survey. Pay-for plans also provide an auto-optimizer, optimization comparison, manual optimizer, and control of survey analysis. (added 04/15/2010)
Techenomics -- Lubricating oil sample analysis and testing, temperature, vibration and condition monitoring by Techenomics International. (added 04/15/2010)
Structural Engineering Calculators, from BuildingsGuide.com -- currently includes ASCE 7-05 Code calculators for Snow Loading Analysis, Ice Loading Analysis for WT, MT & ST shapes, for W, M, S & HP shapes, and for C & MC shapes; Seismic Base Shear for single-level buildings, and Wind Loading Analysis for low-rise buildings. (added 04/15/2010)
SOFA (Statistics Open For All) -- an innovative statistics, analysis, and reporting program. Available for Windows, Mac and Linux systems. Has an emphasis on ease of use, learn as you go, and beautiful output. Check out list of features. (added 04/15/2010)
G*Power 3 -- a very general Power Analysis program for Windows and Macintosh. Performs exact analysis for 6 types of correlation tests, 3 types of bivariate regression tests, 1-group and 2-group comparison of means tests (parametric and non-parametric), 4 types of multiple regression tests, logistic regression, poisson regression, ordinary and repeated-measures ANOVAs, ANCOVAs, MANOVAs, multivariate T2 and MANOVAs, 8 types of tests of proportions (McNemar, Fisher, etc.), 1-group and 2-group variance tests, and completely generic tests involving the binomial, normal, t, chi-square, and F distributions. Computes power, sample sizes, alpha, beta, and alpha/beta ratios. Has a comprehensive web-based tutorial and reference manual. (added 11/16/2009)
Citizendium's online article about free statistical software -- lots of links to free packages, but also other material about free stats software -- a brief history, reviews, advice about using the packages, and limitations of the packages. (added 11/13/2009)
Zelig -- an add-on for R that can estimate, help interpret, and present the results of a large range of statistical methods. It translates hard-to-interpret coefficients into quantities of interest; combines multiply imputed data sets to deal with missing data; automates bootstrapping for all models; uses sophisticated nonparametric matching commands which improve parametric procedures; allows one-line commands to run analyses in all designated strata; automates the creation of replication data files so that you (or anyone else) can replicate the results of your analyses (hence satisfying the replication standard); makes it easy to evaluate counterfactuals; and allows conditional population and superpopulation inferences. It includes many specific methods, based on likelihood, frequentist, Bayesian, robust Bayesian, and nonparametric theories of inference. Zelig comes with detailed, self-contained documentation that minimizes startup costs for Zelig and R, automates graphics and summaries for all models, and, with only three simple commands required, generally makes the power of R accessible for all users. Zelig also works well for teaching, and is designed so that scholars can use the same program with students that they use for their research. (added 11/13/2009)
PSPP -- a free replacement for SPSS (although at this time it implements only a small fraction of SPSS's analyses). But it's free, and will never "expire". It replicates the "look and feel" of SPSS very closely, and even reads native SPSS syntax and files! Some other features...
Online Kappa Calculator -- calculates free-marginal and fixed-marginal variations of birater and multirater Kappas (chance-adjusted measures of interrater agreement). (added 11/08/2009)
SPSS Syntax Files -- a large collection of SPSS routines for randomized study design , sampling strategies, meta-analysis, sanple size for confidence intervals, correlation tests, psychometry and other areas. The documentation is in Portuguese, but the scripts are usable as-is. You can have AltaVista automatically translate the page into English by going here, but do not use the "translated" scripts! The author has recently added two additional sections (in English) -- one for Dyadic Data Analysis, and one for Simple and Complex Random Assignment for Experimental Designs ( updated 10/26/20009)
David Kremelberg's statistical resources page -- contains resources for statistics students, including information and free downloadable Excel templates for Pearson's r, Chi-Square, t-tests, and ANOVA. These templates calculate these statistical tests step-by-step, allowing students who need to calculate these tests by hand to check their work. (added 10/23/2009)