Calculates the Standard Error for the Average Treatment Effect with Lechner's method.
SE for the ATT of
Lechner, M. (2001). Identification and estimation of causal effects of multiple treatments under the conditional indepence assumption. In M. Lechner & F. Pfeiffer (Eds.), Econometric Evaluation of Labour Market Policies (pp. 43-58). Physica-Verlag: Heidelberg.
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