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st: Forecasting interval and robust estimation
I would like to get the forecasting interval for a new observation in a study based
on a growth model with repeated data. When I try to use the option stdf in predict after :
reg weight time, robust cluster(id)
I get the message: "stdf not allowed after robust estimation"
Moreover, stdf is not allowed after xtreg.
Does someone know how to calculate this interval ?
Xavier VIVIAND, M.D./
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