Hanushek, Eric A, <br/><br/>
The use of internal instruments for errors in variables and missing cross products / 
by Eric A. Hanushek and Finis Welch   
 - 18 pages ;  28 cm. 
 - The Rand paper series;  P-5369 .
 - The Rand paper series;  P-5369  .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Variables (Mathematics) <br/>Estimation theory. <br/>Econometrics.