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## Basic statistics

 Summaries Arithmetic, geometric, and harmonic means, and corresponding confidence intervals Medians and percentiles Measurement of central tendency Skewness and kurtosis Confidence intervals Exact binomial (Clopper–Pearson) Wald Wilson Jeffreys Agresti Exact Poisson Ratios, proportions, and totals Confidence intervals Standard errors Over groups Robust and cluster–robust SEs Intragroup tests Watch Descriptive Statistics in Stata tutorial. Tables and tabulations 1-, 2-, n-way Pearson chi-squared Likelihood-ratio chi-squared Cramér's V Fisher's exact (2 x 2 and r x c) Goodman and Kruskal's gamma Kendall's tau Cell statistics Expected count Contribution to Pearson chi-squared Contribution to likelihood-ratio chi-squared Watch Pearson’s chi-squared and Fisher’s Exact Test in Stata tutorial. Watch Combining Crosstabs and Descriptives in Stata tutorial. Noninteger confidence intervals Parametric tests t test (one and two sample) Binomial (one-sample) test Test of proportions (two sample) Bartlett's test Chi-squared (one-sample) variance test Variance ratio (two-sample) F test Watch One-sample t-test in Stata tutorial. Watch t-test for Two Independent Samples in Stata tutorial. Watch t-test for Two Paired Samples in Stata tutorial. Correlations Pearson simple and partial Semipartial Spearman's rank order Kendall's rank order Intracluster Cronbach's alpha Tetrachoric Canonical (multivariate) correlations Watch Pearson’s Correlation Coefficient in Stata tutorial. Tables of summary statistics Over groups and/or variables Statistics may include mean, count, sum, min, max, range, standard deviation, variance, variation coefficient, standard error of mean, skewness, kurtosis, median, percentiles, and interquartile range Creation of datasets of summary statistics Statistics by group or subgroup of observations Statistics: mean, standard deviation, count, min, max, median, percentiles, and interquartile range Automatically create indicators based on categorical variables Form interactions among discrete and continuous variables Include polynomial terms Perform contrasts of categories/levels Watch Introduction to Factor Variables in Stata

Stata 12
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