Many journals have a policy which requires that authors make a work file available for replication purposes. The following link is a comprehensive guide to data sharing and replication policies of funding agencies and journals.Data Sharing and Replication [from Data Sharing and Informatics, Gary King]
The replication policies of journals across a wide variety of disciplines is towards the bottom of the link. The earlier part of the link is a collection of discussion papers on data sharing and the policies of funding agencies, including NIH and NSF.
One other link of interest is the August 2007 issue of the Journal of Sociological Methds and Research. This special issue is devoted to data sharing and data replication.What about restricted data? Can I make my work files available for replication?
In general, data licences have explicit policies prohibiting the re-distribution of the data by the researcher who holds the license. This would include providing a replication file for other researchers.
In addition, many restricted data licenses have disclosure policies, pre-review rules, and citation acknowledgements/disclaimers rules. See Data Services for questions about this.