[R] Degrees of freedom for lm in logLik and AIC

[Frank Harrell]

I have a question about the computation of the degrees of freedom in a linear
model:

x <- runif(20); y <- runif(20)
f <- lm(y ~ x)
logLik(f)
'log Lik.' -1.968056 (df=3)

The 3 is coming from f$rank + 1.  Shouldn't it be f$rank?  This affects
AIC(f).
Thanks
Frank

-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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