I am an undergraduate economics student and I am familiar with difference-in-difference estimators: For example, to evaluate the effect of a policy change, measure the outcome of interest before and after the policy change took place both in the treatment and control group, and then compare the difference in the changes in the treatment and control group.
Doing literature research, I recently came across the term 'cohort study', which seems to be more used in epidemiology. To my understanding, in a cohort study basically the same is being done as in difference-in-difference estimators: compare change in prevalance levels of some disease before and after one group was exposed to to treatment with the change in prevalence levels in an unexposed control group.
Am I right, that these are just different names in different disciplines for the same econometric technique or am I missing something?
I haven't found anything on that in the literature, so I would be grateful for any help!