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st: RE: first stage prediction gets negative value for positive observations
Why not plot the data and your fit,
if that makes sense?
> I'm doing a two stage regression. I'm predicting X1 (X1 are all
> positive) at the first stage and then use the predicted value of X1 at
> the second stage.
> However, the predicted value of X1 shows some negative value, which
> makes no sense in terms of data--X1 cannot be negative. any thoughts?
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