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*To*: asreml@chiswick.anprod.CSIRO.AU*Subject*: orthog polynomials and splines*From*: cronopio@altavista.net*Date*: Mon, 25 May 1998 21:46:05 -0400 (EDT)*Sender*: owner-asreml

Hi, Three questions related to random regressions: How are constructed the orthogonal polynomials in ASREML (or what is de family of polynomials that Arthur used for the program)? If the polynomials are really orthogonal I think the variance matrix of the polynomial coefficients should be a diagonal, but checking in the .res file after fitting a DIAG matrix shows covariance terms different from 0. However, if I try to fit a US matrix, the program does not converge (and it is just jumping from one value to other). Should I just assume that they are zero? If I include something like subject.spl(age) as part of my model (to use a random regression) how is the G matrix specified for that term? e.g. y~spl(age) !r subject.spl(age) etc... ... subject.spl(age) 2 subject 0 spl(age) 0 …? Thanks a lot, Luis &~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~> Luis Apiolaza Palmerston North, New Zealand Web: http://www.geocities.com/Yosemite/Gorge/3063/ Email: cronopio@altavista.net "Quote me as saying I was misquoted" - Groucho Marx &~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>

**Follow-Ups**:**Re: The effect of random interactions.***From:*Leighton Ayre <ayrel@wagsun.agric.nsw.gov.au>

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