which of the following is a necessary assumption for estimating what is strict exogeneity which of the following is a condition of strict exogeneity? which condition violates strict exogeneity strict exogeneity definition what is the difference between lagged and strict exogeneity? why is strict exogeneity violated what is strict exogeneity in a time series how is strict exogeneity violated strict exogeneity means why should exogeneity be violated why strict exogeneity is violated why do time series violate strict exogeneity does strict exogeneity violate lagged variables why is strict exogeneity violated strict exogeneity definition why strict exogeneity what's the difference in strict or lagged time series variable and strict exogeneity? why strict exogeneity violates strict exogeneity what is strict exogeneity