# covariateBalance: Calculate covariate effect size differences before and after... In TriMatch: Propensity Score Matching of Non-Binary Treatments

## Description

This function is modified from the `cv.bal.psa` function in the `PSAgrpahics` package.

## Usage

 ```1 2 3 4``` ```covariateBalance(covariates, treatment, propensity, strata = NULL, int = NULL, tree = FALSE, minsize = 2, universal.psd = TRUE, trM = 0, absolute.es = TRUE, trt.value = NULL, use.trt.var = FALSE, verbose = FALSE, xlim = NULL, plot.strata = TRUE, ...) ```

## Arguments

 `covariates` dataframe of interest `treatment` binary vector of 0s and 1s (necessarily? what if character, or 1, 2?) `propensity` PS scores from some method or other. `strata` either a vector of strata number for each row of covariate, or one number n in which case it is attempted to group rows by ps scores into n strata of size approximately 1/n. This does not seem to work well in the case of few specific propensity values, as from a tree. `int` either a number m used to divide [0,1] into m equal length subintervals, or a vector of cut points between 0 an 1 defining the subintervals (perhaps as suggested by loess.psa). In either case these subintervals define strata, so strata can be of any size. `tree` logical, if unique ps scores are few, as from a recursively partitioned tree, then TRUE will force each ps value to define a stratum. `minsize` smallest allowable stratum-treatment size. If violated, strata is removed. `universal.psd` If 'TRUE', forces standard deviations used to be unadjusted for stratification. `trM` trimming proportion for mean calculations. `absolute.es` logical, if 'TRUE' routine uses absolute values of all effect sizes. `trt.value` allows user to specify which value is active treatment, if desired. `use.trt.var` logical, if true then Rubin-Stuart method using only treatment variance with be used in effect size calculations. `verbose` logical, controls output that is visibly returned. `xlim` limits for the x-axis. `plot.strata` logical indicating whether to print strata. `...` currently unused.

## Details

Note: effect sizes are calculated as treatment 1 - treatment 0, or treatment B - treatment A.

## Author(s)

Robert M. Pruzek RMPruzek@yahoo.com

James E. Helmreich James.Helmreich@Marist.edu

KuangNan Xiong harryxkn@yahoo.com

TriMatch documentation built on May 2, 2019, 12:37 p.m.