The Econometric SocietyEconometrica: Jul 1972, Volume 40, Issue 4
Notes and Comments: The Efficiency of the Two-Step Estimator
https://doi.org/0012-9682(197207)40:4<769:TEOTTE>2.0.CO;2-5
p.
769-770
Kenneth F. Wallis
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p.
769-770
Kenneth F. Wallis