On Fri, 06 Sep 2002 12:32:40 +0000, R.H.Alle wrote: >>To be more specific on the setup: I have data from a hospital. During a >>period of four years, a number of patient were checked once or twice >>every year. During that period, the operator has changed. > I'm no expert on this, but it occurs to me that you might be able to use > blocking to help you account for changes in operator. Any decent text on > experimental design will discuss blocking.
The problem is that the operator has changed at a specific moment in time. Therefore, all data before were acquired by one operator, all data afterwards by another. So, if the first measurement of a patient is done by operator A, the second one probably is too, but the next one (and all subsequent ones) is done by operator B. I think blocking won't help me for this; or maybe I misunderstood the idea... Koen . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
