Stata data management :  reference manual release 9 / 

 - College Station, Tex. :  STATA Corporation,  2005. 
 - 2 v.  tabs. 
<br/><br/><label>ISBN: </label>1-881228-96-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estadística --programas de computo.<br/>Estadisticas--metodos gráficos.
<br/><br/><label>Dewey Class. No.: </label>C 519.5'0285 S7971 2005