what variable can be used as an instrument an example of a variable estimator how are instrumental variables used in a modeling study what is an instrumental variable estimator what is an example of an instrumental variable estimator instrumental variable estimator definition which variable is an instrumental variable example of instrument estimate model instrumental variable estimator example what is an example of instrumental variable estimator? which is an example of an instrument estimator? instrumental variable estimator definition example instrumental variable definition instrumental variable estimator examples what are some helpful instrumental variable estimators instrument variable estimator examples instrumental variable estimator example what are examples of instrumental variable estimators instrumental variable estimator examples instrumental variable estimator example