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Function generating the S-weighs for Wald estimand. The function operates by using only a single dummy as the instrument. It is up to the user to construct this dummy and subset the data accordingly to get the correct Wald weights.
wald(D, Z)
Matrix, one column being 1s, the other being treatment indicator D.
Matrix, one column being 1s, the other being the instrument dummy.
A list of two vectors: one is the weight for D = 0, the other is the weight for D = 1.