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Equivalent of EXCEL LINEST function?

I'm probably just having a brain cramp but I can't figure out how to do
something that seems as simple as the EXCEL function LINEST.

Basically, I have an X vector and a Y vector and I want to find the
linear "best fit" function, the r^2 of that fit, and the standard errors
of all the parameters.  (I could do it all by writing my own routines,
but I'm *SURE* that someone has already done it, you know, steal from
your friends :-)