Re: [R] strange error msg from lapply and lm()

[weix1]

plus, it took long time to complete this analysis for only 24 records!
Although I get the error msg, the result seems to be correct.


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[R] strange error msg from lapply and lm()

[weix1]

I am conducting a very simple t test for two genes using lapply (i try to
avoid loop since i will have thousands of genes later on). however, I got
strange error msg like the followings. It looks that R is complaining my
factor has only one level, which is not the case (I check many times).

 result- lapply(split(all,all$CHIPEXP_NAME),function(x)
 lm(logvalue~treatment,x))
Error in `contrasts-`(`*tmp*`, value = contr.treatment) : 
  contrasts can be applied only to factors with 2 or more levels


can anyone help me to dissect this problem?

thanks in advance.


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