Thanks for your perspective, you have replied to my posts about this topic in the past and I see you all over the forums, always generously sharing sensible and accurate information. 

While not 100% accurate it can sorta give you a ballpark.

I was hoping someone could clarify if this is accurate or am I just not asking the correct questions?  

Excluding Zillow, Redfin, Trulia, Realtor.com, and local agents, where else can we find ACCURATE appraisals/comps for single family homes?

3) itemize your expenses bc you may find out the 50% rule is not accurate for your area. 4) make sure you account for a Third party property manager (this will minimize your issues with non-payment and other tenant issues) I would double check those figures to make sure they are accurate.

How does one estimate the fluctuation of rental income on a cash flowing properly accurately.

How does one predict the market accurately to make the most intelligent assumptions about the economy for more efficient real estate investing?

There are always a million questions about whether or not Zestimates are accurate and whether they should be used for reference.

How accurate is this info?

Data outside a mile or so becomes less and less accurate, depending on the location.