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. 1998 Winter;20(2):19–37.

Table 6. Bivariate Probit Estimates Probability-of-Use Equations from Two-Part Model Parameter Estimates and Standard Errors.

Instrument Bivariate Probit Estimates Two-Stage Least Squares Estimates


Coefficient of QMB Enrollment Average Treatment Effect Coefficient of QMB Enrollment Specification Test Statistic




Standard Mean Deviation Standard Mean Deviation Standard Mean Standard Deviation Mean Deviation
Any Part B Charges (Estimates from Table 3)1 0.474 0.092 0.125 0.023
Percent of Medicaid Population That Is Elderly 0.492 0.545 0.129 0.139 0.268 0.175
Percent of Medicaid Population That Is Elderly, and Its Square 0.516 0.391 0.135 0.100 0.196 0.128 0.37
Percent of Medicaid Population That Is Elderly and Number of QMB Outreach Programs 0-7 0.579 0.484 0.152 0.123 0.257 0.151 0.02
Any Part A Charges (Estimates from Table 3)1 0.292 0.090 0.079 0.025
Percent of Medicaid Population That Is Elderly -0.113 0.518 -0.030 0.138 -0.059 0.172
Percent of Medicaid Population That Is Elderly, and Its Square 0.034 0.407 0.010 0.109 0.056 0.126 1.02
Percent of Medicaid Population That Is Elderly and Number of QMB Outreach Programs 0-7 0.106 0.488 0.029 0.131 0.080 0.147 2.68
1

Estimates in Table 3 are the single-equation probit estimates that assume that QMB enrollment is not a function of anticipated medical care use.

NOTES: Other exogenous variables include those listed in Table 3. QMB is qualified Medicare beneficiary.

SOURCE: Parente, S., and Evans, W., Project HOPE, Bethesda, MD, 1999.