# PReBiM.R Readme

## Main Function: PReBiM(X, Y, G, alpha, direction, B, W)

X  # Exposure variable.
Y  # Outcome variable.
G  # Candidate instrumental variables (IVs).
alpha  # Significance level.
direction  # The direction between the exposure variable X and the outcome variable Y in the model can be either unidirectional or bidirectional.
B  # The length of finding the shortest valid set. 
W  # The maximum length of a set containing valid IVs.

### R Packages to Load
library(AER)
library(MASS)
library(MRCD)
