From: Gorjanc Gregor <Gregor.Gorjanc_at_bfro.uni-lj.si>

Date: Mon 07 Aug 2006 - 18:37:16 EST

"One must learn by doing the thing; for though you think you know it, you have no certainty until you try." Sophocles ~ 450 B.C.

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon Aug 07 18:47:44 2006

Date: Mon 07 Aug 2006 - 18:37:16 EST

Hello!

I would like to use constrain to sum coeficients of a factor to 0 instead of classical corner contraint i.e. I would like to fit a model like

lm(y ~ 1 + effectA + effectB)

and say get parameters

intercept

effectA_1 effectA_2 effectB_1 effectB_2 effectB_3

where effectA_1 represents deviation of level A_1 from intercept and sum(effectA_1, effectA_2) = 0 and the same for factor B.

Is this possible to do?

Gregor Gorjanc

University of Ljubljana PhD student Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan Zootechnical Department mail: gregor.gorjanc <at> bfro.uni-lj.si Groblje 3 tel: +386 (0)1 72 17 861 SI-1230 Domzale fax: +386 (0)1 72 17 888Slovenia, Europe

"One must learn by doing the thing; for though you think you know it, you have no certainty until you try." Sophocles ~ 450 B.C.

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon Aug 07 18:47:44 2006

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