[R] ROCR for combination of markers

[suo]

Hi Eik or other who might help:

I got this error:
"Error in roc.formula(form = y1 ~ x + z, plot = "ROC") : 
  Invalid formula: exactly 1 predictor is required in a formula of type
response~predictor.
"
when I ran "out=ROC( form = y1 ~ x + z, plot="ROC") " from your code.

How to fix it?
Thanks.

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