I tried using rpart, as below, and got this error message "rpart Error in
yval[, 1] : incorrect number of dimensions". Thinking it might somehow be
related to the large number of missing values, I tried using complete data, but
with the same result. Does anyone know what may be going on, and how to fix it?
I have traced two similar error messages in the Archive, but following the
threads did not make it clear how to fix the problem.
> currwh.rpart<-rpart(formula = CURRWHEE~EA17_6_1 + EA17_9_1 + X087 + X148 +
> X260 + MOTHERSA + GESTATIO,method="class")
>
> currwh.rpart
n=6783 (2283 observations deleted due to missing)
node), split, n, loss, yval, (yprob)
* denotes terminal node
1) root 6783 720 3 (0.1060002949 0.8938522778 0.0001474274) *
>
> summary(currwh.rpart)
Call:
rpart(formula = CURRWHEE ~ EA17_6_1 + EA17_9_1 + X087 + X148 +
X260 + MOTHERSA + GESTATIO, method = "class")
n=6783 (2283 observations deleted due to missing)
CP nsplit rel error
1 0 0 1
Error in yval[, 1] : incorrect number of dimensions
>
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