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I'd like to compare logistic regression models using the BIC. I have 600 data points, but only 30 of these belong to the class of interest. To calculate the BIC I need to know my sample size, $N$.

In my case, is my sample size 600 or 30? Should the BIC calculation use the total size of my dataset (600), or just the number of positive samples (30)?

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  • $\begingroup$ BIC, AIC look at all your data. $\endgroup$ – Jon Dec 18 '16 at 4:34
  • $\begingroup$ How many points did you train your classifier on? This is your sample size. $\endgroup$ – quant_dev Jun 21 '18 at 11:56
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If you have used all 600 points when fitting your model, then the sample size $n$ is 600.

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