average calculates the average value for the past and current numeric values. mean is a synonym for average.
For example, given the following case fragment,
13 Feb 03 03 Oct 03 16 Nov 03 Cholesterol 7.3 5.6 6.1 Triglyceride 1.1 0.8 1.1 HDL 2.0 2.2 pending
average Cholesterol > 6.3
mean Cholesterol > 6.3
average Cholesterol within last 2 months is 5.85
mean Cholesterol within last 2 months is 5.85
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