Urgent request.
Can anybody help me with many to many merge?
I have two datasets A and B, each has six variables (5 explanatory variables: agegroups, sex, service type, service group, and year) and one outcome variable (hospital admissions rate). I want to calculate age-sex-service type-service group-year specific rate ratio but don't know how to merge these two files together as there is no unique matching ID and two files have difference number of rows.
Thanks
... View more