The Econometric SocietyEconometrica: Jul 1972, Volume 40, Issue 4
Notes and Comments: A Note on the Use of Proxy Variables
https://doi.org/0012-9682(197207)40:4<759:ANOTUO>2.0.CO;2-6
p.
759-761
Michael R. Wickens
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p.
759-761
Michael R. Wickens