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xpt conversion problem

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xpt conversion problem

I have a combined XPT file (file1) which has 10 datasets.

I used PROC COPY to convert it to SAS datasets, then use PROC COPY again to convert those datasets back to a new combined XPT file (file2).

The file2 is slightly bigger then file1. All the datasets in the two XPTs have the same observations and variables.

I am just curious what is the reason.

Thanks for your attention!

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