subject:"\[R\] QR factorization for aov"

Re: [R] QR factorization for aov

2013-06-12 Thread peter dalgaard

On Jun 11, 2013, at 20:26 , Mimi Celis wrote: > I am looking at the aov function in R. I see that it uses a modified QR > factorization routine dqrdc2 based on the Linpack routine dqrdc. Pivoting is > done different than the original Linpack function. > > My questions: > > * Why is it nece

[R] QR factorization for aov

2013-06-11 Thread Mimi Celis

I am looking at the aov function in R. I see that it uses a modified QR factorization routine dqrdc2 based on the Linpack routine dqrdc. Pivoting is done different than the original Linpack function. My questions: * Why is it necessary to modify the pivoting strategy? Something necessary f