which is an example of a proxy variable what is the proxy variable approach for the crime rate which is an example of a proxy variable in a regression analysis? what is proxy variable approach what is the proxy variable for crime rate? what is the proxy approach for omitted variable which variable is endogenous in a regression? why is crime omitted is crime rate endogenous why does it need to have an omitted variable how to use the proxy variable approach which is a proxy variable? why use it what is a proxy variable example what is the proxy variable approach for crime statistics what is the proxy variable for crime rate what is the example of endogeneity with omitted variable what is the proxy approach used for which is an important characteristic of a proxy variable? why use a proxy variable what is the proxy variable approach for omitted variable bias