Lechner, Michael,  1962- <br/><br/>
The estimation of causal effects by difference-in-difference methods / 
Michael Lechner. 
 - ix, 60 pages ;  24 cm. 
 - Foundations and trends in econometrics ;  4:3. .
 - Foundations and trends in econometrics ;  4:3. .
<br/><br/>Includes bibliographical references : (pages 50-60). 
<br/><br/><label>ISBN: </label>9781601984982  RM199.98 1601984987