Table 5. Probit Estimates of QMB Enrollment Equation Parameter Estimates and Standard Errors.
| Independent Variable | Model 1 | Model 2 | Model 3 | |||||||||
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| Probit Estimates | Marginal Effects | Probit Estimates | Marginal Effects | Probit Estimates | Marginal Effects | |||||||
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| Mean | Standard Deviation | Mean | Standard Deviation | Mean | Standard Deviation | Mean | Standard Deviation | Mean | Standard Deviation | Mean | Standard Deviation | |
| Percent of Medicaid Population That Is Elderly | 0.071 | 0.014 | 0.028 | 0.004 | 0.345 | 0.057 | 0.137 | 0.022 | 0.066 | 0.014 | 0.026 | 0.005 |
| Percent of Medicaid Population That Is Elderly, Squared | — | — | — | — | -1.319 | 0.250 | 0.519 | 0.098 | — | — | — | — |
| Number of State-Run QMB Outreach Programs | — | — | — | — | — | — | — | — | 0.077 | 0.024 | 0.030 | 0.009 |
NOTES: QMB is qualified Medicare beneficiary. Other exogenous variables include those listed in Table 3.
SOURCE: Parente, S., and Evans, W., Project HOPE, Bethesda, MD, 1999.