The Identity Change Report.txt file is created during every OYSTER run. It is stored in the directory specified for the output link index or .idty file. This file provides details pertaining to updates, merges, and new identity creations that took place during the run. It also provides information as to the number of input identities and output identities. The level of detail provided in this output document can be specified by setting the value of the "ChangeReportDetail" attribute to "On" or "Off" (see section 1.3 <Settings> Tag)

It is important to mention that due to how the RSwoosh and FSCluster engines in OYSTER were initially designed to handle matching internally, the change reports may be different when running the same records on different engines. FSCluster identifies some merges as updates since the update status takes precedence over merge internally whereas RSwoosh will identify the same consolidation as a merge. This is to be expected in OYSTER v3.2 and the initial release of OYSTER v3.3 but will be updated in the final release of OYSTER v3.3 such that the Change report matches between all engines.

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