[R] rpart question

[Joshua Wiley]

Hi Amanda,

Can you reproduce the error with a small subset of the data?  If so,
could you send it to us?  For instance if say 20 cases is sufficient,
you could send the output of dput() which pastes easily into the
console:

dput(yourdata[, c("ENROLL_YN", "MINORITY")])

You could also try calling traceback() after the error to get a bit
more diagnostics (and post those if they do not make any sense or help
you).

Hope this helps,

Josh

On Sun, Jan 8, 2012 at 1:48 PM, Amanda Marie Elling <elling at stolaf.edu> wrote:
> We are trying to make a decision tree using rpart and we are continually
> running into the following error:
>
>> fit_rpart=rpart(ENROLL_YN~MINORITY,method="class")
>> summary(fit_rpart)
> Call:
> rpart(formula = ENROLL_YN ~ MINORITY, method = "class")
>  n= 5725
>
>  CP nsplit rel error
> 1  0      0         1
> Error in yval[, 1] : incorrect number of dimensions
>
> ENROLL_YN is a categorical variable with two options- yes or no.
> MINORITY is also a categorical variable with two options- 0 or 1.
>
> We have confirmed that all variables are the same length and there are no
> NAs.
>
> Does anyone have any ideas that might help?? All thoughts would be
> appreciated, thanks!
>
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>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/