External Validity in Policy Evaluations That Choose Sites Purposively
Journal of policy analysis and management, 2013, Vol.32 (1), p.107-121 [Peer Reviewed Journal]Copyright © 2013 Association for Public Policy Analysis and Management ;2012 by the Association for Public Policy Analysis and Management ;Copyright Wiley Periodicals Inc. Winter 2013 ;ISSN: 0276-8739 ;EISSN: 1520-6688 ;DOI: 10.1002/pam.21660 ;PMID: 25152557 ;CODEN: JPAMD7
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