"x-validation vs. performance operator"

fmonfmon Member Posts: 7 Contributor II
edited June 2019 in Help
I am designing a prediction model based on decision tree.
Once I used an x-validation operator consisting of decision tree in training part and apply model and performance in testing part.Another time I used a sequence of three operators of decision tree,apply model and performance.But I got different results.I'd like to know the reason.


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    frasfras Member Posts: 93 Contributor II
    To get a roughly performance error estimation only the first method is suitable (X-Validation).
    In your second approach you train a model and test it on the same data, right ? This approach overestimates
    every performance criterion.
    Shortly said: Only compare different models via performance criteria generated by applying X-Validation
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