Description Usage Arguments Value Examples
This function generates the design matrix given an IV specification.
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formula 
Formula with which to generate the design matrix. 
data 

subset 
Condition to select subset of data. 
treat 
The name of the treatment variable. This should only be passed when constructing OLS weights. 
orig.names 
character vector of the terms in the final design
matrix. This is required when the user declares an IVlike
formula where the treatment variable is passed into the

Three matrices are returned: one for the outcome variable, Y; one for the second stage covariates, X; and one for the first stage covariates, Z.
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