Displaying 3 results from an estimated 3 matches for "p162".
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162
2003 Jun 26
3
lm diagnostics and qr (fwd)
I have been struggling to find some informaation on what lm exactly does.
I know it uses the QR decomp. However, I was recently faced with a
somewhat badly scaled matrix and summary(lm) said
Coefficients: ( 4 not defined because of singularities)
does anyone know how lm chooses these 4 coef. is it forward building of
the model --> drop last when qr sends a non full rank design matrix?
My
2006 Jun 09
3
GXP-2000 MultiPurpose Keys
Is it possible to program the multi-purpose keys on a GXP-2000
remotely via a TFTP configuration file? If so, what are the
parameters to put in the configuration file?
Thanks,
Daniel
2003 Jun 27
1
R-help Digest, Vol 4, Issue 27 ( -Reply)
...qr sends a non full rank design matrix?
- Probably you've seen this, but just in case...
- There's a quite good explanation of QR with column pivoting and the
subsequent detection of rank deficiency in the least squares context in
Golub and Van Loan, Matrix Computations (1983, section 6.4. p162 - I don't
have newer editions to hand).
Simon
_____________________________________________________________________
> Simon Wood simon at stats.gla.ac.uk www.stats.gla.ac.uk/~simon/
>> Department of Statistics, University of Glasgow, Glasgow, G12 8QQ
>>> Direct tele...