With the functionality that MapPoint offers currently, the best solution would be to generate lat/lon values for ALL of your records, and then bring all your data back into MapPoint as a single data set using lat/lon as the geographic marker. This is a bit of extra work (having to import, calculate lat/lon, export, and re-import) but you do get the single-dataset analysis capability you are looking for.



The other option would be to extract the data as separate datasets and somehow merge them in Excel before doing the analysis, but I would guess that is not a good solution.