[R] cv.binary problem

[Amit Sengupta]

HI,I am analyzing a risk model for type 2 diabetes using a logistic regression. In the final model I have only 6 predictors. The regression gives correct output (fullmod is the fitted model). Now I  try to do cross validation using cv.binary. Any help in resolving this problem will be appreciated.
> cv.binary(fullmod)
Error in sample.int(x, size, replace, prob) : invalid 'size' argument
Regards,Amit

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