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However, one important criticism is that experiments merely provide a black-box view of causality and fail to identify causal mechanisms. Specifically, critics argue that although experiments can identify average causal effects, they cannot explain the process through which such effects come about.  If true, this represents a serious limitation of experimentation, especially for social and medical science research that strive to identify causal mechanisms.  In this paper, we consider the several different experimental designs that help identify average natural indirect effects.  Some of these designs require the direct manipulation of an intermediate variable, while others can be used even when only imperfect manipulation is possible.  We use recent social science experiments to illustrate the key ideas that underlie each of the proposed designs."}}]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"Imai, Kosuke, Dustin Tingley and Teppei Yamamoto, \"Experimental Designs for Identifying Causal Mechanisms\", Journal of the Royal Statistical Society, Series A, forthcoming."}}]},{"typeName":"dateOfDeposit","multiple":false,"typeClass":"primitive","value":"2011-08-08"}]}},"files":[{"description":"Data from Brader et al. experiment","label":"brader_trim_nomiss.tab","restricted":false,"version":1,"datasetVersionId":51795,"categories":["Data"],"dataFile":{"id":2302231,"persistentId":"doi:10.7910/DVN/LMC3FM/VAXV2L","pidURL":"https://doi.org/10.7910/DVN/LMC3FM/VAXV2L","filename":"brader_trim_nomiss.tab","contentType":"text/tab-separated-values","friendlyType":"Tab-Delimited","filesize":14727,"description":"Data from Brader et al. experiment","categories":["Data"],"storageIdentifier":"s3://dvn-cloud:70333","originalFileFormat":"application/x-stata","originalFormatLabel":"Stata Binary","originalFileSize":15371,"originalFileName":"brader_trim_nomiss.dta","UNF":"UNF:5:knfQrHu8s/s7cnu4nIlUXg==","rootDataFileId":-1,"md5":"270f4ece4595389372724e760bdfeb93","checksum":{"type":"MD5","value":"270f4ece4595389372724e760bdfeb93"},"tabularData":true,"creationDate":"2011-08-08","publicationDate":"2011-09-28","lastUpdateTime":"2011-08-08T14:35:14Z","fileAccessRequest":false}},{"description":"R code for replicating the numerical example and producing Figure 2","label":"fig2.R","restricted":false,"version":1,"datasetVersionId":51795,"categories":["Code"],"dataFile":{"id":2302230,"persistentId":"doi:10.7910/DVN/LMC3FM/TIJE0V","pidURL":"https://doi.org/10.7910/DVN/LMC3FM/TIJE0V","filename":"fig2.R","contentType":"text/plain; charset=US-ASCII","friendlyType":"Plain Text","filesize":26008,"description":"R code for replicating the numerical example and producing Figure 2","categories":["Code"],"storageIdentifier":"s3://dvn-cloud:70334","rootDataFileId":-1,"md5":"5f8ddbbdf12e2efc0aaf915312731a84","checksum":{"type":"MD5","value":"5f8ddbbdf12e2efc0aaf915312731a84"},"tabularData":false,"creationDate":"2011-08-08","publicationDate":"2011-09-28","lastUpdateTime":"2011-08-08T14:35:14Z","fileAccessRequest":false}},{"description":"","label":"readme.txt","restricted":false,"version":1,"datasetVersionId":51795,"categories":["Documentation"],"dataFile":{"id":2302232,"persistentId":"doi:10.7910/DVN/LMC3FM/FYSHER","pidURL":"https://doi.org/10.7910/DVN/LMC3FM/FYSHER","filename":"readme.txt","contentType":"text/plain; charset=US-ASCII","friendlyType":"Plain Text","filesize":855,"description":"","categories":["Documentation"],"storageIdentifier":"s3://dvn-cloud:70335","rootDataFileId":-1,"md5":"c65c89d81a22fb6a0a8d3c852c334be4","checksum":{"type":"MD5","value":"c65c89d81a22fb6a0a8d3c852c334be4"},"tabularData":false,"creationDate":"2011-08-08","publicationDate":"2011-09-28","lastUpdateTime":"2011-08-08T14:35:14Z","fileAccessRequest":false}}]}}}