Answered By: Bobray Bordelon Last Updated: Apr 12, 2017 Views: 54
If your dataset has less than 1,000,000 rows, you can open it in Excel 2007 or higher.
Here are the steps:
- Sort the PERMNO field or the field you want to deduplicate and select the column
- From the Menu bar, Data-> Filter-> Advanced Filter
- In the Advanced Filter Dialog Box, check the "Filter the list, in-place" button, and check the "Unique records only" checkbox, then OK.
If your dataset has more than 65000 rows, you can open it in Stata.
Here are the steps to deduplicate PERMNO:
- Assume you save the .csv file in H: drive.
- cd H:
- insheet using mydata.csv
- sort permno
- duplicates drop permno, force
- outsheet using deduplicatedpermno.csv, c
Where deduplicatedpermno.csv is the dataset with unique PERMNOs.
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