The way to do this is to enter the complete file a second time and use the Document - Validate Duplicate Files function. This lets you set more than one key field.

Another way would be to sort the original data (on ID and Visit), sort your paper files the same way and do duplicate entry with recordnumber as the key.

Jamie

Lindsay wrote:

I am preparing a double entry verification dataset for a longitudinal study; each participant has 6 follow-ups.

Obviously, I'd like the double entry to compare the original entry with the correct follow-up number. For example, ID 100 has 6 follow-ups. I'd like to compare the original entry of follow-up 6 for ID 100 to the new entry of follow-up 6.

As far as I know, you can only use ONE identifiable number to compare each entry, which makes double entry for a longitudinal study inconvenient. Is there a way to use both the ID number as well as the follow-up number while doing double entry?