Especially, in small markets like Grove City where there may be limited available data. 

In calculating the Net Present Value of the investment, what is the appropriate methodology to use in arriving at a discount rate?

Data driven and research and investor friendly agents are always reach higher levels in the industry.I never interviewed big name companies, and I'm glad I didn't.

I hear the BP podcasts reference interesting data points like; price to rent ratio, time on market, vacancy rates, population growth, etc.

I did some research and my best guess is the automated messages are being sent to phone numbers based on data from data broker websites. 

You determine the probabilities from the statistics of a large data set … 200 flips in the example.Once you have done 200 rental units you can determine the EV going forward.Not a very satisfactory answer I know.

I'm asking for aggregate not granular data.

I guess Iḿ weary of investing education being traded in for topics solely driven by repeated cable news/radio rhetoric.

So if the debt is driven higher and the home goes to public auction and is lost then they should be able to move on to buy or rent another home.

Just because you are given the same data as someone else does not mean you will make the same decisions.