Acumen Lewin Harvard
Market Level Analysis

•   Used a 2-stage regression method:
Step 1:
OLS regression without fixed effects.
Step 2: First stage estimates of area effects regressed against a set of market-level measures (outlined in Appendix D).

•   Method comparable to Harvard; see Appendix F: Harvard Market Level Analysis Methodology Memorandum (11.21.12).

•   Used Harvard-developed market level measures (Appendix F.1).

•   Used a 2-stage regression method:
Step 1:
OLS regression without fixed effects.
Step 2: First stage estimates of area effects regressed against a set of market-level measures (outlined in Appendix D).

•   Used different set of market predictors.

•   Used a 2-stage regression method: Step 1: OLS regression without fixed effects.
Step 2: First stage estimates of area effects regressed against a set of market-level measures (outlined in Appendix D).

•   Method comparable to Acumen; see Appendix F: Harvard Market Level Analysis Methodology Memorandum (11.21.12).

Quality Analyses

•   Conducted logistic regression for the IQI and PSI, and OLS regression for the PQI composites.

•   Conducted logistic regressions for the PSI and PQIs, predicted the outcomes at an individual level and then averaged at area level to produce a rate.

•   Risk adjusted based on covariates from cluster regressions rather than covariates used in the AHRQ methodology (PHE, p. 12).

•   Used logistic models for “rare” quality outcomes, and linear models for all other outcomes.

•   The rate is risk adjusted by multiplying the ratio of observed to expected outcomes by a reference rate.

Model Specification Clusters Refer to Appendix D for the complete list of independent variables used by each subcontractor.
Correlation Analyses
“Within” Analysis

•   Examines the distribution of the ratios (10th percentile, 90th percentile, min, max, etc.) of the highest-spending to lowest-spending HSAs by HRR

•   OLS regression specifications followed.

•   Wald Test on HSA fixed effects within HRR. Statistical significance indicated intra-regional variation

•   Examines the distribution of the ratios (10th percentile, 90th percentile, min, max, etc.) of the highest-spending to lowest-spending HSAs within by HRR



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