Creating data
Dear Doug and Achim,
On 3/25/09, Achim Zeileis <Achim.Zeileis at wu-wien.ac.at> wrote:
Thanks for including us and advertising our package, Doug!
Actually, we use our "exams" package to generate simple two-way ANOVA
examples in our stats exams at WU Wien. The approach is very similar to
the one previously suggested: generate some random regressors, compute the
model matrix, draw random coefficients, set certain coefficients to zero
(if there should be only some main effects) and then simulate the final
data.
For a one-way ANOVA, there is an example in the package, see
library("exams")
exams("anova")
and see the underlying code in ~/inst/exercises/anova.Rnw.
hth,
Z
Thanks for the pointer to and example from the exams package. I had heard about the package and flipped through the vignette, but didn't appreciate just how powerful this package could be. Very, very cool. Regards, Jay