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RE: st: different age effect between groups
I would like to thank Svend and Maarten for their very useful advice
about how to model the interaction effect between age and invited to
The Svend's advice is, as usual, exemplarily clear, the Maarten's one
is more sophisticated but substantially coincident.
The finding that the screening test increases its effect with age is
important even if already documented. I will not miss to note that it
exists in the Italian screening data set too.
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