Using ArcMap 10.3.1.
I have searched for an answer, but have only found reference to merging polygons which does not answer my question.
Each postcode polygon has a value (total number of survey participants). I would like to 'assign' the data from the postcode polygons to the regional polygons; however, some postcode polygons intersect more than one regional polygon. I'd like to allocate to whichever polygon it is most contained within, and then sum the 'number of participants for the region.
I have tried 'Spatial Join' and 'Intersect' but these have not worked out.