Unable to link observations across certain months using CPSIDP?

Hi,

I am trying to link June 1995 records to July and August 1995 using cpsidp, but it seems I can only get ~4% of records to link to either month; and of the linked records, age, sex, and/or race in June and July/August disagree ~92% of the time. Any help would be much appreciated, thanks!