Biørn, Erik - In: Empirical Economics 47 (2014) 2, pp. 451-468
A system of regression equations for analyzing panel data with random heterogeneity in intercepts and coefficients, and … unbalanced panel data is considered. A maximum likelihood (ML) procedure for joint estimation of all parameters is described … proposed algorithm for modified ML estimation are illustrated by using panel data for output, inputs and costs for 111 …