compareBinary takes in a variable e.g. union
and runs bivariate regression of x on treatment (for summary statistics)
compareSingleBinary(
  x,
  on,
  dta,
  w = rep(1, nrow(dta)),
  report = c("diff", "levels", "both")
)variables to run regression on
binary variable
the data to use
weights
which type of report to make; diff is the difference between the two variables by group
matrix of results