SERVICE PROCESS KAIZEN: ADOPTING PROCESS STABILIZATION METHODS TO CONTROL SERVICE WORK FLOW AND TO IMPROVE CUSTOMER SERVICE I drop MSAs that are not in SAT states or where available completion rate data cover less than two thirds of public enrollment. This leaves a sample of 931 districts from 50 MSAs. In spite of the serious limitations in the CCD data, the pattern of results in Panel D is quite similar to that in Panel C. Again, the student quality index is a strong predictor of completion rates, but its coefficient is (insignificantly) smaller in high-choice than in low-choice MSAs
