Simultaneous equations with incomplete panels

This paper compares the performance of several single and system estimators of a two equation simultaneous model with unbalanced panel data. The Monte Carlo design varies the degree of unbalancedness in the data and the varia nce components ratio due to the individual effects. One useful result for a pplied researchers is that the feasible error components 2SLS and 3SLS proc edures based on simple ANOVA type estimators of the variance components per form well with incomplete panels and are recommended in practice.