Application	Procedures
SPSS	Analyze ➔ Descriptive Statistics ➔ Frequencies … then press the ‘Statistics’ button and choose Std. Deviation, Variance, Range, Minimum and/or Maximum as appropriate. SPSS does not produce or have an option to produce either the IQR or S-IQR, however, if your request ‘Quantiles’ you will see the 25th and 75th %ile scores, which can then be used to quickly compute either variability measure. Remember to select appropriate central tendency measures as well.
NCSS	Analysis ➔ Descriptive Statistics ➔ Descriptive Statistics then select the reports and plots that you want to see; make sure you indicate that you want to see the Variance Section of the Report. Remember to select appropriate central tendency measures as well (by opting to see the Means Section of the Report).
SYSTAT	Analyze ➔ Basic Statistics … then select SD, Variance, Range, Interquartile range, Minimum and/or Maximum as appropriate. Remember to select appropriate central tendency measures as well.
STATGRAPHICS	Describe ➔ Numerical Data ➔ One-Variable Analysis... or Multiple-Variable Analysis... then choose the variable(s) you want to describe and select Summary Statistics (you don’t get any options for statistics to report – measures of central tendency and variability are automatically produced). STATGRAPHICS does not produce either the IQR or S-IQR, however, if you use One-Variable Analysis... ‘Percentiles’ can be requested in order to see the 25th and 75th %ile scores, which can then be used to quickly compute either variability measure.
R Commander	Statistics ➔ Summaries ➔ Numerical summaries... then select either the Standard Deviation or Interquartile Range as appropriate. R Commander will not produce the range statistic or report minimum or maximum scores. Remember to select appropriate central tendency measures as well.