Measurement errors in the binary instrumental variable model
二元工具变量模型中的测量误差AI 解读 ↓
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二元工具变量模型中的测量误差AI 解读 ↓
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Summary Instrumental variable methods can identify causal effects even when the treatment and outcome are confounded. We study the problem of imperfect measurements of the binary instrumental variable, treatment and outcome. We first consider nondifferential measurement errors, that is, the mismeasured variable does not depend on other variables given its true value. We show that the measurement error of the instrumental variable does not bias the estimate, that the measurement error of the treatment biases the estimate away from zero, and that the measurement error of the outcome biases the estimate toward zero. Moreover, we derive sharp bounds on the causal effects without additional assumptions. These bounds are informative because they exclude zero. We then consider differential measurement errors, and focus on sensitivity analyses in those settings.
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通过最优传输部分识别工具变量下的政策相关处理效应
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无需第一阶段单调性的工具变量排除与外生性敏感性分析
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