This page explains how Frank A. Roth (USATT# 9592)'s rating went from 1767 to 1791 at the Trolley Car TTC May 2012 Phill held on - 26 May 2012. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.