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参与时长不同时的学前项目评估：一种非参数方法AI 解读

Nonexperimental data are used to evaluate impacts of a Bolivian preschool program on cognitive, psychosocial, and anthropometric outcomes. Impacts are shown to be highly dependent on age and exposure duration. To minimize the effect of distributional assumptions, program impacts are estimated as nonparametric functions of age and duration. A generalized matching estimator is developed and used to control for nonrandom selectivity into the program and into exposure durations.…

不完全市场下农业环境中的动态储蓄决策AI 解读

A methodology is developed for examining savings behavior in rural areas of developing countries that explicitly incorporates the sequential decision process in agriculture. The approach is used to examine the relative importance of alternative forms of savings in the presence and absence of formal financial intermediaries. The authors' results, based on stage-specific panel data from Pakistan, provide evidence that the presence of financial intermediaries importantly…

农业生产动态与热量摄入—收入关系：来自巴基斯坦的证据AI 解读

Panel data on farm households from rural Pakistan are used to estimate the calorie response to different components of income in an analysis that takes into account the sequential nature of agricultural production, labor and capital market imperfections, heterogeneity, and productivity effects of calories. The estimates indicate that the income-calorie relationship depends importantly on production stage, the form of income, the liquidity of assets, and the extent to which…