18.Fixed effects with unbalanced panels Consider the following unobserved effects model You plan on using fixed effects to estimate the model. Suppose you have a panel data set consisting of 10 individuals over 5 years. However, you are missing the last 2 years of data for the seventh, , individual in your data set. 7 Your panel data set has total observations Suppose the reason individual i is missing data for certain time periods (called attrition) is correlated with the unobserved effect, a This correlation cause the fixed effects estimators to be biased. does Te al i does not