How is the Variable Appraisals component of RAT-STATS used for the Discovery Sample analysis?
After creating the text file of overpayments based on the results of the Discovery Sample, select the Variable Appraisals component of RAT-STATS to calculate the mean and standard deviation of the overpayment amount in the sample. To calculate the mean and standard deviation of overpayments in the sample, the sampling units from the Discovery Sample should be reviewed and a dollar difference determination should be made on each sampling unit (i.e., the difference between what was reimbursed and what should have been reimbursed based on the reviewer’s determination). The mean and standard deviation of the overpayment amount in the Discovery Sample is used to determine the Full Sample size. To use the Variable Appraisals feature: • choose the “Unrestricted” option; • input the name and location of the text file (e.g., c:/probe.txt); • enter the universe size; • choose “Difference Values” for the data file format (the text file created is composed of the dollar difference of what was paid
