STATA USER’S GUIDE RELEASE 13 ® A Stata Press Publication StataCorp LP College Station, Texas ® Copyright c 1985–2013 StataCorp LP All rights reserved Version 13 Published by Stata Press, 4905 Lakeway Drive, College Station, Texas 77845 Typeset in TEX ISBN-10: 1-59718-115-3 ISBN-13: 978-1-59718-115-0 This manual is protected by copyright. All rights are reserved. No part of this manual may be reproduced, stored in a retrieval system, or transcribed, in any form or by any
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