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Here you find a collection of Free Descriptive Statistics Software modules (Calculators). The modules have been grouped in Univariate, Bivariate, Trivariate, and Multivariate categories. All modules can be used with any dataset that contains ungrouped observations.

Main Menu	return to Main Menu
Univariate Descriptive Statistics - Ungrouped Data
Plot & describe dataseries	generates a simple plot of the dataseries and allows one to enter a description (useful for future reference when the computation is submitted to the archive)
Central Tendency	arithmetic mean, geometric mean, harmonic mean, median, midrange, midmean, robustness of central tendency (winsorized and trimmed mean), etc...
Variability	range, variance, standard deviation, variation, MSE, absolute deviation, interquartile difference, coefficient of quartile variation, Gini's mean difference, Leik's D, dispersion, diversity, qualitative variation, mean square deviation, etc...
Concentration	entropy, exponential index, Herfindahl, variation coefficient, Gini coefficient, Lorenz curve, etc...
Moments	general, non centered & centered moments, trimmed moments
Skewness/Kurtosis	Fisher 3rd centered moment, Fisher beta 1 & gamma 1, Pearson, Yule's skewness (according to 8 different quartile definitions), Beta, Gamma, small sample skewness, Fisher 4th centered moment, Fisher beta 2 & gamma 2, small sample kurtosis, etc...
Quartiles	weighted average, empirical distribution, closest observation, TrueBasic(TM), Excel(TM), etc...
Percentiles	normal probability plot, weighted average, empirical distribution, closest observation, TrueBasic(TM), Excel(TM), etc...