Entropy is a measure of how much disorder exists within a system (its interpretation is similar to entropy in physics). We will calculate it by cohort:

seqHtplot(mvad.seq,group=group__, title = "Entropy index")

The following screenshot shows the entropy for each group/week:

Evidently, the entropy should be low at the beginning as most people are enrolled at L1. We should expect it to go up dramatically after Weeks 7-10, since this company is offering a discount at around that stage, so people might then jump into L2 or L3.