differences from average

differences from average calculates the difference between each numerical episode in a sample sequence and the average value. For example, we might define a Calculated Value

DeltaFromAverageHDL = differences from average HDL

This would appear in a case as follows:

                   01 Jun 03    20 Jun 03    30 Jun 03    15 Oct 03    02 Nov 03
                     17:29        17:33        20:06        20:06        17:33
HDL                   2.0          4.0                       2.5          3.5
DeltaFromAverageHDL  -1.0          1.0                      -0.5          0.5
Trig                  3.6                                    3.6
LipidDrug             N                         Y            Y

Note that the expression differences from mean may also be used for this function.