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Terms and conditions of use

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Copyright statement for the Stata Journal

The Stata Journal and the contents of the supporting files (programs, datasets, and help files) are copyright © by StataCorp LP. The contents of the supporting files (programs, datasets, and help files) may be copied or reproduced by any means whatsoever, in whole or in part, as long as any copy or reproduction includes attribution to both (1) the author and (2) the Stata Journal.

The articles appearing in the Stata Journal may be copied or reproduced as printed copies, in whole or in part, as long as any copy or reproduction includes attribution to both (1) the author and (2) the Stata Journal.

Written permission must be obtained from StataCorp if you wish to make electronic copies of the insertions. This precludes placing electronic copies of the Stata Journal, in whole or in part, on publicly accessible websites, fileservers, or other locations where the copy may be accessed by anyone other than the subscriber.

Users of any of the software, ideas, data, or other materials published in the Stata Journal or the supporting files understand that such use is made without warranty of any kind, by either the Stata Journal, the author, or StataCorp. In particular, there is no warranty of fitness of purpose or merchantability, nor for special, incidental, or consequential damages such as loss of profits. The purpose of the Stata Journal is to promote free communication among Stata users.

The Stata Journal (ISSN 1536-867X printed version, 1536-8734 electronic version) is a publication of Stata Press, and Stata is a registered trademark of StataCorp LP.


Copyright statement for the website

(c) Copyright 1996–2014 StataCorp LP

Copyright 1996–2014 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

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  • the above copyright notice along with this permission notice appear.

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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.

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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 NONINFRINGEMENT.

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.