ROC_score: Ratio of Counts Function
In MUNFAI15/cmf: Comparative Metrics Framework for Evaluating Synthetic Data

This function allows you to determine the Ratio of Counts(ROC) between 2 datasets, whereby the ratio of counts is an indication of the overlap between 2 datasets. Specifically, it calculates the ROC between 2 datasets for each variable. The overall ROC is the arithmetic mean of all the ROC scores.

1	ROC_score(data1, data2, num_cat = 2000, min_items = 5)

`data1`	1st dataset
`data2`	2nd dataset
`num_cat`	Number of categories that can be evaluated. Defaults to 2000
`min_items`	Minimum mumber of items in a category. Defaults to 5. If the number falls below this threshold, this particular variable will be omitted from the calculation of the ROC score.