A sensitivity analysis for nonrandomly missing categorical by Baker S. G.
By Baker S. G.
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Suppose that we can measure human height or human weight much more accurately than these usual measurements. How would this aﬀect judgments in the table? In particular, what studies might be interesting that measure human weights on an hourly basis or human height on a daily or even half-daily basis? 6. 2, think of a completely new set of studies that might use the same time spacings given in the table. 7. Why might recruiting patients at a second clinic complicate the analysis of a study? What aspects of the data might be diﬀerent at the second clinic?
We can see that a single mouse is heaviest at days 14, 17, and 20. It was not the heaviest mouse at time 11 or earlier. The second heaviest mouse at days 14 and 17 is outweighed by yet another mouse at day 20. We see that the mouse that was heaviest at days 3–6 was one of the two mice that were measured daily. It ends up among the heaviest mice but is not the heaviest. Generally we see that the mice all grow in parallel; if mouse A is heavier than mouse B at an earlier time, it has a tendency to be heavier at a later time.
The subject proﬁle is a plot of the individual subject’s response plotted against time. On top of the population average, individuals may have trends that diﬀer in pattern from the population average, and these patterns must also be modeled for proper inference in a longitudinal data set. We will discuss ways to model population trends over time as a function of covariates in chapter 7. 4 Complex Data Structures As mentioned earlier, the basic longitudinal data structure is a simple random sample of subjects and longitudinal repeated measures within subject.