Application	Procedures
SPSS	Analyze ➔ Descriptive Statistics ➔ Frequencies … then press the ‘Statistics’ button and choose mean, median and mode. To see trimmed means, you must use the Analyze ➔ Descriptive Statistics ➔ Explore … Exploratory Data Analysis procedure; see Procedure 5.6.
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 ‘Means Section’ of the Report. If you want to see trimmed means, tick the ‘Trimmed Section’ of the Report.
SYSTAT	Analyze ➔ Basic Statistics … then select the mean, median and mode (as well as any other statistics you might wish to see). If you want to see trimmed means, tick the ‘Trimmed mean’ section of the dialog box and set the percentage to trim in the box labelled ‘Two-sided’.
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 will not report modes and you will need to use One-Variable Analysis... and request ‘Percentiles’ in order to see the 50%ile score which will be the median; however, it won’t be labelled as the median.
R Commander	Statistics ➔ Summaries ➔ Numerical summaries... then select the central tendency statistics you want to see. R Commander will not produce modes and to see the median, make sure that the ‘Quantiles’ box is ticked – the .5 quantile score (= 50%ile) score is the median; however, it won’t be labelled as the median.