percentage change in … from … calculates the percentage change between two values. For example, given the following case fragment:
01 Jun 03 20 Jun 03 30 Jun 03 15 Oct 03 02 Nov 03 HDL 2.0 2.1 1.2 2.0 2.4 LDL 6.2 4.7 3.1 Trig 3.6 3.6 LipidDrug N Y Y
percentage change in HDL from second most recent HDL is 20
percentage change in LDL from max LDL is -50