To avoid some of the issues with IBES Adjusted data (highlighted in the Videos and Tutorials section of the WRDS website), researchers tend to use IBES Unadjusted data to calculate earnings surprises and perform the split adjustment manually using more accurate split data from such sources as CRSP.
One of the WRDS Research Applications demonstrates a sample methodology for calculating Earnings Surprises under Post-Earnings Announcement Drift using IBES Unadjusted Data.
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