Further on recovery from coma: (a) The example in Section XXXXXXXXXXon recovery from coma uses data on performance IQ. The original analysis of the data by Wong et al. (2001) also examined verbal IQ....

Further on recovery from coma:

(a) The example in Section 24.2.1 on recovery from coma uses data on performance IQ. The original analysis of the data by Wong et al. (2001) also examined verbal IQ. Repeat the analysis using verbal IQ as the response variable, employing the nonlinear mixed-effects model in Equations 24.7. Compare the results for postcoma recovery of performance and verbal IQ.

 (b) Figure 24.5 (page 755) shows the trajectory of postcoma performance IQ as a function of length of coma and days postcoma, with days postcoma on the horizontal axis of the graph and lines drawn for selected values of length of coma. Using the estimates of the fixed effects (given on page 754), draw an alternative graph with length of coma on the horizontal axis and different lines for selected values of days postcoma. Then draw a 3D plot of the fitted regression surface, with average PIQ on the vertical axis and length of coma and days postcoma as the ‘‘horizontal’’ axes.