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When you set a grouping variable (for example you might Barchart Sales grouped by Region) the default is to sum the data into each category defined by the group code. This will give one bar for each unique value in Region, each bar being the total sales for that region. The functions which you can use here are:
ch.Set 'head' 'Mean Barley Yield by Year' ch.Set 'gfn' 'mean' ch.Set 'gvar' year ch.Bar yield
All these functions take account of the current Missing Value setting, so totals and averages will correctly omit missing data.
See also ...
GroupBy group variable
MissingValue missing value(s)