decision tree - Arguments length error when trying to test model using party package in R -

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i have divided data set 2 groups:

  1. transactions.train (80% of data)
  2. transactions.test (20% of data)

then built decision tree using ctree method party package follow:

transactions.tree <- ctree(dt_formula, data=transactions.train)

and can apply predict method on training set , use table function output result follow:

table(predict(transactions.tree), transactions.train$satisfaction)

but problem occurs when try output table based on testing set follow:

testpred <- predict(transactions.tree, newdata=transactions.test) table(testpred, transactions.test$satisfaction)

and error follow:

error in table(predict(pred = svm.pred, transactions.tree), transactions.test$satisfaction) :    arguments must have same length

i have done research on similar cases suggested omitting na values did without changing error outcome.

can me poniting out what's problem here?


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