Data scaling

I have over 500 000 data records. The variable fields of interest are amount, issue date and age. Data can be identical across the three fields and I want to remove some of the data records.

For example, if i have 10 data records with the same amount, issue date and age, I need to remove 20% of the records (i.e. 2 records) and only have 8 records left. 20% is the scaling factor.

The code will therefore find the total number of records that are identical and remove 20% of such records.

Due to the size of the data, I cannot do that manually so I would really really appreciate your help.

Please see sample data attached. Original data is in columns B to G. After scaling down by 20%, I expect data to be as in columns I to N. Records with same cell colors are identical. Note a table for checking in columns P to T.

Please note that I have also asked for help on MrExcel.com and ozgrid.com

Thank you in advance
Evans

Rule 08: Cross-posting Without Telling Us

Your post does not comply with Rule 8 of our Forum RULES. Do not cross-post your question on multiple forums without telling us about your threads on other forums.

Post a link to any other forums where you have asked the same question. If you have fewer than 10 posts here, you will not be able to post a link, but you must still tell us where else you have asked the question.

Cross-posting is when you post the same question in other forums on the web. The last thing you want to do is waste people's time working on an issue you have already resolved elsewhere. We prefer that you not cross-post at all, but if you do (and it's unlikely to go unnoticed), you MUST provide a link (copy the url from the address bar in your browser) to the cross-post.

Expect cross-posted questions without a link to be closed and a message will be posted by the moderator explaining why. We are here to help so help us to help you!

Read this to understand why we ask you to do this, and then please edit your first post to include links to any and all cross-posts in any other forums (not just this site).

If you have less than 10 posts, do not try to copy and paste the link. Instead, type the link out in your thread.

No further help to be offered, please, until the OP has complied with this request.

Thanks for the cross-post notification. Please don't do this again without first alerting us.