Hello,

For a research I want to combine 3 datasets. First I want to combine the AuditAnalytics dataset with Compustat;North-America Daily;fundamentals annual (both from WRDS-Wharton). I took the years 2006 till 2009 and selected "CIK" for company codes. After selecting all the available variables, I wanted to merge these 2 datasets into 1 by using "CIK" as the main variable to base the merging on. However, when I try to merge, I get the message: "variable cik does not uniquely identify observations in the master data. How can I solve this?

After the merging of AuditAnalytics and Compustat, I want to merge the BoardEx dataset in it as well. However, the first step is already going wrong.
I hope somebody can help me.

Thanks in advance for any help!