Testing Conditional Mean Independence Under Symmetry

Tao Chen, Yuanyuan Ji, Yahong Zhou and Pingfang Zhu

Journal of Business & Economic Statistics, 2018, vol. 36, issue 4, 615-627

Abstract: Conditional mean independence (CMI) is one of the most widely used assumptions in the treatment effect literature to achieve model identification. We propose a Kolmogorov–Smirnov-type statistic to test CMI under a specific symmetry condition. We also propose a bootstrap procedure to obtain the p-values and critical values that are required to carry out the test. Results from a simulation study suggest that our test can work very well even in small to moderately sized samples. As an empirical illustration, we apply our test to a dataset that has been used in the literature to estimate the return on college education in China, to check whether the assumption of CMI is supported by the dataset and show the plausibility of the extra symmetry condition that is necessary for this new test.

Date: 2018
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DOI: 10.1080/07350015.2016.1219263

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