This function calculates
K_M_var_factor, a numeric vector. Each entry in
this vector is a function of the number of times each unit is matched to, aka
K_M(i) (corresponding to
Kiw, where M corresponds to
M_matches. The calculation
in this function comes from Theorem 7, page 251 of Abadie and Imbens (2006)
K_M_var_factor is an important component in the variance
estimation, created in the function
A vector of times each unit is matched to
Number of matches per unit for imputing potential outcomes, as in Abadie and Imbens (2006).
A numeric vector.
This function is exported for use in other packages.
Abadie, A., & Imbens, G. W. (2006). Large sample properties of matching estimators for average treatment effects. econometrica, 74(1), 235-267. https://doi.org/10.1111/j.1468-0262.2006.00655.x
calcKMVarFactor(Kiw = 2, M_matches = 4)
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