← Search Econometrica Vol. 40 No. 4 1972 The Efficiency of the Two-Step Estimator Kenneth F. Wallis DOI10.2307/1912974 Volume40 Issue4 Pages769 Sources bibtex:phds-export.bib semanticscholar crossref openalex Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓