I have a dataset in which I have identified a three-way interaction. Factor
A has 3 levels, factor B has 4 levels, and factor C has 3 levels.  I would
like to produce the following:

 

1)       A manova in which I can test the effect of factor C for each
combination of factor A * factor B.  I know how to do this using a series of
"do" commands, but I wonder whether there is a more significant solution.
For other converts from SAS, I am specifically looking for the R equivalent
of the "by" command in PROC GLM.

2)       Create a table of means that, for each level of factor B, shows the
interaction of factors A and C. Thus, I need to manipulate summary.formula
or another table-generating program to produce subtotals. If that is not
possible, is there another way to avoid generating and binding multiple
subsets into one table?

 

I have searched the R-help archives and the internet, but to no avail.  The
closest posting that I have found is:
http://tolstoy.newcastle.edu.au/R/help/05/04/3239.html. Would someone please
help me?

 

Thank you.

 

Matthew M. Harbur

University of Minnesota Southwest Research and Outreach Center

23669 130th Street

Lamberton, MN  56152

(507) 752-5091 (office)

(507) 752-5097 (fax)

 


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