- The adjustmentSets package in the dagitty R package, can analyze a DAG and find the variables to control in order to block the backdoor. 
- adjustmentSets( dag_name , exposure_vars ="X" , outcome_vars ="Y" )

University of California, Santa Cruz

- List the paths connecting the potential cause of interest and the outcome.
- Classify each path as open or closed; paths are open unless a collider is present. 
- Classify each path by whether its a backdoor path or not; backdoor paths have an arrow entering its potential cause of interest.
- Then, open any backdoor paths, and decide which variables to condition on in order to close it. 

The method to figure out what variables to include and which ones to not

McElreath, R. (2020). Statistical Rethinking: A Bayesian Course with Examples in R and STAN (2nd ed.). Chapman and Hall/CRC.

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