This might be a simple question (I'm sure it is), but it's also my first here, so please go easy...on the other hand I'm possibly conflating a few points...
I'm helping a charity out, and have a bundle of result sets from various campaigns - individuals responding to an email message. I can't see the underlying data, but I can see the response broken down by Mosaic Codes (I can also get the Mosaic composition of who was targeted).
The trouble is that I have 239 different Mosaic Codes; and only about 50 sets of results.
I'm concerned that I'll get spurious results if I have so many possible explanatory variables. I could just run an analysis at a "higher" Mosaic level, where there are only c15 different categories, but they are keen to drill deeper.
There are clearly some relationships between different Mosaic codes - is this a case for dimension reduction?