But I don't want the original mean y ,but the "corrected mean y" of analysis of
covariant.
Also,the difference of original mean y is not 136.83,which is the difference of
the "corrected meany".
ÔÚ 2013-03-09 20:11:11£¬"R. Michael Weylandt" <michael.weyla...@gmail.com>
дµÀ£º
On Sat, Mar 9, 2013 at 10:35 AM, meng <laomen...@163.com> wrote:
Hi all:
My data is in the attachment.
I want to analysis the mean difference of y between 2 sex.
My code:
result_lm<-lm(y~factor(sex) + x1 + x2)
summary(result_lm)
The result of "factor(sex)m" 136.83, is the mean difference of y between 2
sex,and the corresponding p value is 0.07618.
My question is: how to get the mean y of sex(m) and sex(f) respectively via lm
function?
lm() would be overkill no? I'd just use tapply(), by(), ave(), or the like:
e.g.,
tapply(dat$y, dat$sex, mean)
Cheers,
MW
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