The stata.com website is intended for Stata customers and others interested in statistics. We appreciate receiving comments about the site; email firstname.lastname@example.org.
Please review our privacy notice.
© Copyright 1996–2015 StataCorp LP
Copyright 1996–2015 StataCorp LP, 4905 Lakeway Drive, College Station, TX 77845 USA. Permission to use, copy, and distribute documents delivered from this World Wide Web server is hereby granted, provided
All other rights are reserved.
The name StataCorp or the Stata logo may not be used in advertising or publicity pertaining to distribution of this information without specific, prior written permission.
The products and offerings described in these documents may be subject to Intellectual Property rights reserved by StataCorp and are not licensed hereunder.
Note that the pictures, icons, and logos encoded in gif files and other formats are either copyrights and/or trademarks of StataCorp LP or others from whom StataCorp has received permission to incorporate into this site. In the context of this site, they are covered by the above Copyright notice. However, the pictures, icons, and logos may not be individually extracted and used in other websites without the written permission of StataCorp or the respective copyright or trademark holder.
Stata ®, the Stata logo ®, Mata ® and NetCourse ® are registered trademarks of StataCorp LP.
Other brand and product names are registered trademarks or trademarks of their respective companies.
THIS PUBLICATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
This document could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein. StataCorp may make improvements and/or changes in the products and programs described in this document at any time.