The trinity study back in 1998 is the primary study that ran all the statistical analyses over different time horizons in the market and discovered that withdrawing 4% per year would give you a >95% chance of having sustained income for a 30 year retirement without running out of funds. 

Ive  recently been reading labor statistics and city data info.

Will you still buy and hold confidently in 500 year flood plains thinking that these floods are statistically rare?

Maybe your PMC isn't advertising it where you think they are.Here's what we do for our clients with advertised vacants:Marketing Pics are edited, so your property looks its best:Pics have our Watermark, to avoid crooks copying them and creating fake ads that may result in our ad being dropped from a website.Advertising is published on 20+ websites :We no longer use “For Rent” signs, they statistically attract lower quality prospects and increase the likelihood your property will have a break-in and theft.We track Web Views and Inquiries, analyzing the numbers to identify problems and trends.Showings are exclusively scheduled via our online scheduling software:Prospects can self-schedule at their convenience, 24/7/365, which increases showings.Prospects receive multiple automated communications after a showing, encouraging them to apply and give feedback.We track Scheduled Showings versus Completed Showings to identify potential problems.Our bi-weekly Property Marketing Reports show you Period & Total amounts for the following:Web ViewsInquiriesShowings ScheduledCompleted ShowingsApplicationsWe analyze this data to provide you feedback about what the numbers mean we should do to get your property rented faster.

The more properties you have the higher odds of having "some empty" but the lower odds of having "total disaster" - but it's usually the statistical outliers that screw us in life :)Obviously I am not suggesting you run without a cash cushion until you hit zero sum by the way, I am saying you need to have that PLUS an increasing percent of cash on hand as you expand your debt leveraging.

I'd love to see the most accurate market statistics available, and as soon after month end as I can.

Personally I believe the cycle that count are the ones that are so obvious you don't need statistics and charts to tell you it is happening.

Here is an example of my local associations monthly statistics. https://www.tucsonrealtors.org/docs/default-source/Stats/statsdec2014.pdf?

Statistically you are not likely to get a deal until you have sent out 1000 to as many as 5000 direct mail pieces.

I spend a lot of time on 3rd party websites which analyze AirBnB statistics, and for the most part they are junk.