[R] confidence interval in "predict.lm"
Matej Cepl
matej at ceplovi.cz
Fri Nov 15 19:57:27 CET 2002
Thomas Lumley wrote:
> You asked R for a confidence interval for the predicted mean at x. If you
> want a prediction interval at x you need interval="prediction" not
> interval="confidence".
Slightly OT question to this thread:
How can I get critical values for given distribution density?
E.g. function f which would give me 2.228 for ft(p=0.05,df=10)
(i.e., t for student distribution with given level probability).
Sorry for newbie question.
Matej
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