confidence interval in "predict.lm"
Matej Cepl <matej at ceplovi.cz> writes:
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).
qt(p=0.975,df=10)
[1] 2.228139
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