After implementing an IV probit model, the signs of many exogenous covariates' coefficient estimates have been flipped, compared to the signs in the baseline probit model. These signs are now at odds with the past literature. I originally thought the IV approach would only significantly impact the coefficient estimates of the endogenous variables. What does this indicate? Is it because my instrument is not valid?
BTW, my model has two endogenous variables and two instruments.
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