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st: RE: St: predicted values in zinb regression
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: St: predicted values in zinb regression
Date
Fri, 18 Mar 2011 17:51:03 +0000
Not surprising at all. Every model bar a perfect model is likely to fail to predict the extreme values observed of the response variable, as the predicted response is a kind of smoothing or averaging. The question is more do you want to regard rounded predictions as, practically, predictions of zero (or other results).
Nick
[email protected]
rachel grant
I have used the command predict n to generate a set of predicted Y
values after running zinb regression. I have my predicted values but
there are no zeros in the predicted values at all, although in most
cases the predicted value was very small where a zero should be e.g.
0.35. Is this OK or have I done something wrong? As I had two highly
significant predictors of zeros in the model I was expecting zeros in
the predicted values.
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