Understanding the numbers on the Market Trend function on Bigger Pockets

[James Newman]

Good afternoon,

I was wondering if someone could help me understand the stats and points of analysis on the market trends page and how to use them/interpret them, what the benchmarks are (what's good and what's bad), and how to compare them to other markets. 

Also, where does that data come from? For example, Huntsville, AL has a 11.40% appreciation and 8.43% YoY rent growth. Where is that data coming from?