c) [6 points] (13.2.3) Construct a new variable, Ptime, where: Ptime : 0 it baseline. and Ptime : 1 if post-baseline (any of the four successive 2week intervals). Repeat the analysis for Problem 13.2.1 using Ptime (instead of Time as a categorical variable with 5 levels). Construct a test of the null hypothesis of no effect of treatment on changes in the log seizure rate based on the empirical standard errors. SOLUTION