Does the OIG require certain statistical software to be used when performing a Claims Reviews?
In the past, the OIG required the reviewer to use RAT-STATS, a statistical software package developed by the OIG’s Office of Audit Services. RAT-STATS is publicly available in downloadable form through the OIG Web site. The users manual can be downloaded from the same site. Both the software and the users manual are free. The OIG no longer requires RAT-STATS to be used when performing Claims Reviews. If the reviewer chooses to use a statistical software program other than RAT-STATS, in its report to the OIG, the reviewer should provide a description of the software package used to conduct the Claims Review and should provide the supporting documentation generated from the software package (e.g., random number printouts and sample size estimate printouts) to support its sampling methodology and results.
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