Normality Test Stata. Https campusguides lib utah edu stata login to libapps. The shapiro wilk w is the ratio of the best estimator of the variance to the usual corrected sum of squares estimator of the variance shapiro and wilk 1965 5the statistic is positive and less than or equal to one.
See mv mvtest normality for multivariate tests of normality. The former include drawing a stem and leaf plot scatterplot box plot histogram probability probability p p plot and quantile quantile q q plot. Checking homoscedasticity of residuals last updated.
See r sktest for a test allowing more observations.
The normality test helps to determine how likely it is for a random variable underlying the data set to be normally distributed. Checking normality of residuals 2 checking normality of residuals 3 previous. Checking homoscedasticity of residuals last updated. This article explains how to perform a normality test in stata.
