getCovMeanDiffs returns the covariate mean differences between two groups.
Covariate matrix (with units as rows and covariates as columns).
Binary indicator vector (must contain 1 or 0 for each unit). For example, could be a binary treatment or instrument.
Covariate mean differences between two groups.
Zach Branson and Luke Keele
Branson, Z. and Keele, L. (2020). Evaluating a Key Instrumental Variable Assumption Using Randomization Tests. American Journal of Epidemiology. To appear.
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#load the data data(icu.data) #the covariate matrix is X = as.matrix(subset(icu.data, select = -c(open_bin, icu_bed))) #covariate mean differences across the treatment getCovMeanDiffs(X = X, indicator = icu.data$icu_bed) #covariate mean differences across the instrument getCovMeanDiffs(X = X, indicator = icu.data$open_bin)
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