Hi track2cars, and welcome to the site.
Quite a few changes are currently being made to the site, including the research tool, so if you can just hold on for a few more weeks that tool should be a lot more effective.
To answer your question, it is giving you a positive percentage, so the higher the number, the better the market.
I would suggest using it only as a guide along with all your other research, don't read the results as fact, then invest the house on the results...lol
Cheers