[R] means comparison in R (post-hoc test)

Liaw, Andy andy_liaw at merck.com
Thu Sep 15 18:43:15 CEST 2005


Do RSiteSearch("lsmeans") and go from there.

Andy

> From: Felipe
> 
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> Thank you, I think multcomp is very near to what I was looking for.
> However, I am still looking for a mean to obtain least-squares
> (adjusted) means and std. errors of these means, and performing
> comparisons among these means, as the LSMEANS do in SAS. I have read
> other messages and have looked at car, effects and Design 
> manuals, but I
> am not sure if this is what I am looking for. Any clue?
> 
> Felipe
> 
> Dieter Menne wrote:
> | Felipe <felipe <at> unileon.es> writes:
> |
> |
> |>With the SAS/STAT, I generally used the MEANS (for comparison of
> |>arithmetic means) and the LSMEANS (for adjusted means) 
> statements of the
> |>GLM procedure (I think it is equivalent to lm in R). They 
> provided a lot
> |>of tests: LSD, Duncan, Tukey-Kramer, Bonferroni, Scheffé, SNK, etc.
> |>However, in R I have only discovered Tukey-HSD.
> |
> |
> | Package multcomp with the workhorse-function simint comes close to
> what you
> | want.
> |
> |
> | Dieter
> |
> | __
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