Displaying 2 results from an estimated 2 matches for "material3".
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2002 Jan 18
2
Replacing data.frame values
Hello,
I have two data frames, NameAndConc.df and
WhichOnes.df. NameAndConc.df has two columns, the
first column is the names of some material, and the
second column is the concentration of active
ingredient.
> NameAndConc.df
name conc
1 material1 0.8
2 material2 0.5
3 material3 0.4
WhichOnes.df has two columns, each of which specifies
which material.
> WhichOnes.df
component1 component2
1 material2 material3
2 NA material1
3 material3 material2
4 material2 NA
>From these two data.frames, I'd like to generate a
third data frame that is...
2005 Feb 16
2
problem with se.contrast()
I am having trouble getting standard errors for contrasts using se.contrast() in
what appears to be a simple case to me. The following test example illustrates
my problem:
Lab <- factor(rep(c("1","2","3"),each=12))
Material <- factor(rep(c("A","B","C","D"),each=3,times=3))
Measurement <-