← Search Econometrica 1984 The x[superscript]2 Goodness of Fit Statistic for Models with Parameters Estimated from Microdata James J. Heckman Sources 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 ✓