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Why are there “Archive” query pages for previous releases?

April 26, 2017archive pages previous query releases

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Why are there “Archive” query pages for previous releases?

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CDC’s current policy on data release requires that previously published data remain available for researchers for comparison purposes. WONDER provides the previously published data designated as “archive” data, in contrast to the currently available published release. Each year the Compressed Mortality File is updated with a new year of data. Other revisions are made to the preceding years of data, such as changes in denominator population estimates and changes in county location codes.