DataGroomr will automatically create two datasets Person Accounts and Business Accounts.

In Salesforce Person Accounts are found simultaneously in both Account and Contact objects.  Analyzing and merging these dupes in Accounts (Person Account) will also resolve the duplicates found in Contacts.

Note: Salesforce does not allow merging Contacts of type Person Accounts. So, for the total number of records DataGroomr will not count contacts which are person accounts.