So I thought Epidemiology sounded interesting, but when looking at a curriculum for Epi it looks like it is mostly Biostats. Are Epidemiology jobs mostly dealing with Biostats?
Alright thanks
Epidemiology and Biostats have some overlap but they are quite different. Epidemiology is going to incorporate more knowledge of Science, diseases processes, microbiology, etc. although this knowledge can be useful in certain Biostats courses as well (like Longitudinal Data and Survival Analyses). Epidemiology is quantitative as well but, from what I have seen, it does focus more on applied material and less on theory/proofs than BIOS.
Biostats, though, is clearly heavier on the Mathematics side. As frustrating as it is, you need to know your Mathematical Statistics cold especially to study BIOS at the doctoral level. You need to know your distributions (Chi Square, Gamma, Normal, F, etc.) how they combine, likelihood tests, MGFs and all that stuff. In addition, knowing Matrix Algebra well helps a LOT in BIOS. It's all matrices; even your basic linear regression equation is all matrices and vectors, though it may not seem that way when SAS/R does it for you (although those programs themselves are performing matrix algebra). It helps to be good at proofs as well.
Within the Math spectrum, BIOS is still lighter than Applied Math, which is lighter still than Pure Math. That said, the Math in BIOS is not that easy and is going to be tough especially for those who did not major in quantitative fields in College or soon thereafter.
People in both fields will spend a lot of time in front of SAS/R screens, but I don't see them as that similar.