THO2010DEM

Imbens and angrist 1994 angrist and imbens 1995

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Unformatted text preview: rist and Imbens 1995; Angrist et al. 1996). Also, while I account for some heterogeneous treatment effects by including interactions with gender, there may be other differential effects of the incentive and distance that are not included in the IV analysis (see Imbens and Angrist 1994; Heckman and Jeffrey Smith 1997; Heckman 2001; Heckman et al. 2006).15 I first examine the effects of receiving an HIV diagnosis on condom purchases and reported sexual activity among those who reported having sex at the time of the baseline survey: 63 percent of HIV-negative and 66 percent of HIV-positive individuals.16 Note that this reduces the sample of HIV-positives for the analysis and thus much of the focus of the analysis is among the 15 However, among HIV-positives and HIV-negatives, there are no large differences in prior belief of HIV status or in measures of wealth by incentive or distance among those who obtained their HIV results and those who did not, suggesting that heterogeneous treatment effects across incentives or distance may be minimal (not shown). 16 Approximately 17 percent of the HIV-negatives and 11 percent of the HIV-positives refused to answer if they had had sex in the past year and they are excluded from this analysis. The majority of those refusing to answer were unmarried adolescents. VOL. 98 NO. 5 THORNTON: THE DEMAND fOR, AND IMpAcT Of, LEARNING HIV STATUS Table 6—First Stage 0.153* 1 0.0812 0.309*** 1 0.089 2 20.067** 1 0.026 2 20.117* 1 0.062 2 0.018 1 0.0112 0.047 1 0.104 2 20.058 1 0.130 2 0.023 1 0.040 2 0.199** 1 0.076 2 20.033** 1 0.013 2 20.161 1 0.442 2 20.714 1 0.638 2 0.195 1 0.1772 0.401** 1 0.193 2 20.059 1 0.036 2 20.067 1 0.235 2 0.750* 1 0.3772 20.235** 1 0.115 2 20.171 1 0.2372 0.034 1 0.046 2 20.231 1 0.275 2 20.279** 1 0.112 2 0.406*** 1 0.103 2 1,008 0.22 74.98 Got results (1) Any incentive Amount of incentive Amount of incentive2 Distance (km) Distance2 Any 3 male Amount 3 male Amount2 3 male Distance 3 male Distance2 3 male Any 3 male 3 HIV Amount 3 male 3 HIV Amount2 3 male 3 HIV Distance 3 male 3 HIV Distance2 3 male 3 HIV Any 3 HIV Amount 3 HIV Amount2 3 HIV Distance 3 HIV Distance2 3 HIV HIV Male Constant Observations R2 f2statistic 20.001 1 0.004 2 0.001 1 0.002 2 0...
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