William,
> > It might not matter for security, but for my application it
> does. The
> > information from the master data set (that will be
> anonymised) will have to
> > be merged into a new dataset (to be anonymised with the
> mapping). If the
> > mapping contains ties, -merge- wouldn't know which of the
> tied records to
> > insert in the new dataset.
>
> No.
>
> There is no problem. The mapping will not contain ties even if ties
> arise due to the random numbers drawn. Every person will in the data
> will have a unique id.
I was talking about the situation that:
uid newid
123-45-6789 100
999-99-9999 100
123-45-6789 should get characteristics a from the other dataset and
999-99-9999 chars b. With the new mapping they get at best a or b, but most
likely, the merge won't even work.
Best regards,
-Hendri.
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