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Summaries

• Arithmetic, geometric, and harmonic means, and corresponding confidence intervals
• Medians and percentiles
• Measurement of central tendency
• Skewness and kurtosis
• Confidence intervals
  • Means
    • Normal
    • Exact Poisson
  • Proportions
    • Exact binomial (Clopper–Pearson)
    • Wald
    • Wilson
    • Jeffreys
    • Agresti
  • Variance
    • Normal
    • Bonett
• Ratios, proportions, and totals
  • Confidence intervals
  • Standard errors
  • Over groups
  • Robust and cluster–robust SEs
  • Intragroup tests

Tables and tabulations

• 1- , 2- , n-way
• Pearson's 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

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
• Results from any summary-statistics command

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

Pairwise comparisons of means

• Pairwise differences in means with tests and confidence intervals
• Multiple-comparison adjustments: Bonferroni, Šidák, Scheffé, Tukey HSD, Duncan, and Student–Newman–Keuls adjustments
• Group comparisons that are significant
• Balanced and unbalanced data