On Tue, 17 Sep 2002 18:51:42 +0200, "Koen Vermeer" <[EMAIL PROTECTED]> wrote:
>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... I see -- I neglected the element of time. I don't work with temporal data, so I'm completely ignorant about how blocking might work in this case, if at all. Sorry. Anyone else care to comment? . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
