Hello R help-ers,
I have a basic question, but I have been playing with it for a while and
haven't quite gotten a hang of how to get it working. I want to perform
multiple one-way ANOVAs on subsets of data and am not sure how to do it in
an automated way. I am thinking of doing something similar to 'aggregate'
but I would like to collect all of the ANOVA results in a way in which I can
get to the information from each of the independent ANOVAs. In effect, I
would like a data frame with each of the subset identifiers, F and P values
in the rows. Or a list of all of the ANOVA summaries or something like
that.
I would like to do an anova of the form aov(var ~ day) for each subset of
data corresponding to "temp" and "line". I have lots of temps and lines and
would like to do this in an automated fashion. I know of the aggregate
function for doing this kind of thing to compute means etc, but I am not
sure how to call an anova in this way. I have looked at "by" and "apply"
and have tried various things but am unable to get it to work.
Any help would be greatly appreciated. A sample of the dataset is below.
Thank you for your time,
Kevin
temp line day var
12 WMG 1 LD 70.59
12 WMG 1 LD 100.00
12 WMG 1 LD 100.00
12 WMG 1 SD 85.00
12 WMG 1 SD 75.00
12 WMG 1 SD 90.00
12 WMG 2 LD 100.00
12 WMG 2 LD 83.33
12 WMG 2 LD 100.00
12 WMG 2 SD 91.67
14 WMG 1 LD 76.03
.
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