See the chart from Fair Isaac Company (FICO) below: FICO Score Pct of Population Default Probability 800 or more 13.00% 1.00% 750-799 27.00% 1.00% 700-749 18.00% 4.40% 650-699 15.00% 8.90% 600-649 12.00% 15.80% 550-599 8.00% 22.50% 500-549 5.00% 28.40% Less than 499 2.00% 41.00% Source: Fair Isaac CompanyAccording to this chart, investors should use corresponding vacancy+tenant-nonperformance factors of approximately 5% for Class A rentals, 10% for Class B and 20% for Class C.To address Class C payment challenges, many industry "experts" are now selling programs to newbie investors about how Section 8 tenants are the cure.

I have followed some of your great advice you have shared on other threads as well as some chart on what to follow and read. thanks a 1000000 times. 

I bring the same discipline and precision from my athletic career into real estate.

Hey @Mohit Khanna here are a couple charts comparing the major cities in Texas (top 100 by size). 

- How long the unit sits vacant for repairs/cleaning, and finding a tenant- City/town/state the unit is inPlease respond with your thoughts, hopefully with the bullet points above as points of reference and stated as such in your reply (I know, I am asking for a lot from you all :) ) But, for example, a Class D property in Milwaukee, WI probably requires less turnover time, lower quality materials, not as precise of a paint job, etc, than perhaps a Class A property in San Francisco, which would require higher quality materials, higher labor costs, longer vacancy since more precise craftsmanship would be required, etc.

The breakdown of the economy and the next ten years was fantastic, with graphs, charts, and data for the nerds like me.

Here's a couple charts on home value and rent-to-price ratio trends in Raleigh/Durham and surrounding areas (@V.G Jason to your point on RTP)

Is there a chart or calculator that would give me estimates?

I, personally, understand what your data and charts mean.

Your exact thought of a quad is precisely what I recommend in your position.