STATISTICS MENU 

Summary statistics 

After you have selected Summary statistics in the menu, the Select variable dialog box appears on the 

screen, and in this dialog box you can identify the variable to be analyzed in the statistical procedure.  You 

can also enter a selection criterion in the Select field, in order to include only a selected subgroup of data 

in the statistical procedure, as described in the Introduction part of this manual. 

Options 

 Logarithmic 

transformation 

  Chi square test, Kolmogorov Smirnov test, or D Agostino Pearson test for Normal distribution. 

The chi square goodness of fit test is applied to binned data (the data are put into classes) (Cochran 

& Snedecor, 1989) and requires a larger sample size than the Kolmogorov Smirnov test (Neter et al., 

1988), which is based on the greatest discrepancy between the sample cumulative distribution and the 

Normal cumulative distribution.  The D Agostino Pearson test (Sheskin, 2004) computes a single P 

value for the combination of the coefficients of Skewness and Kurtosis (see below).  

  Subgroups: (optionally) select a categorical variable to break up the data in several (max. 8) 

subgroups. Summary statistics will be given for all data and for all subgroups. 

  Percentiles: allows to select the percentiles of interest. 

The following statistics are calculated and displayed in the results window: 

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