agostino.test D'Agostino test of skewness all.cumulants Statistical Cumulants all.moments Statistical Moments anscombe.test Anscombe-Glynn test of kurtosis bonett.test Bonett-Seier test of Geary's kurtosis central2raw Central to raw moments geary Geary's measure of kurtosis jarque.test Jarque-Bera test for normality kurtosis Pearson's measure of kurtosis moment Statistical Moments raw2central Raw to central moments skewness Skewness of the sample