[R] getting serial anovas from a complex lm object obtained with a matrix of responses

From: Mark Kimpel <mwkimpel_at_gmail.com>
Date: Thu, 03 Apr 2008 10:00:18 -0400


I have fit a model to ~20k different genes and would now like to extract the p-val for one of the effects, again for each individual gene.

My model code is:
mod <- lm(myResponseMatrix~ Time)

Were I to do this with a response vector rather than matrix, the following would work:
anovaResult<- anova(mod)

With a more complex lm object, such as that generated above, it seems anova is trying to compare all the models to each other, a Herculean task for ~20k models and NOT what I want.

Without resorting to a slow loop/apply approach, is there a way to get lightening fast anova results in a fashion similar to that obtained from lm?

Mark

-- 
Mark W. Kimpel MD ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

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Received on Thu 03 Apr 2008 - 14:07:44 GMT

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