Baltagi, Badi H.; Liu, Long - In: Statistics & Probability Letters 79 (2009) 20, pp. 2189-2192
Baltagi and Li [Baltagi, B.H., Li, Q., 1992. A note on the estimation of simultaneous equations with error components. Econometric Theory 8, 113-119] showed that for estimating a single equation in a simultaneous panel data model, EC2SLS has more instruments than G2SLS. Although these extra...