Be sure and disclose that your numbers are estimates based on the best available data at the time.     

I recently wrote a program to scrape property info from public records and a few other data sources.

It doesn't matter if you are young or old, totally new or need to build upon your experience.Yes, you have just announced a commitment to the thousands in this community about your seriousness regarding REI and have taken this bold step to affirm it.Your time on this site and with the BiggerPockets community will be well spent and can be financially rewarding if you so desire.You are here at the Forum, but, should raise your mouse to the top and explore the otherheadings displayed.Don't get overwhelmed by the massive amount of data archived on this site.Simply, bone up on the areas that you need to expand knowledge in such as, Forums,Marketplace, Learn, Network, Analyze, Resources.Feast on the Podcasts, #askbp Podcasts, blogs, webinars and the myriad of bookrecommendations.Also, you can review the quick links below to help solidify your grip on this site. http://www.biggerpockets.com/starthere http://www.biggerpockets.com/ubg http://www.biggerpockets.com/meet Setting up Keyword Alerts How to Use @Mentions on BiggerPockets 25 Tips for Real Estate SuccessAfter becoming more knowledgeable and confident because of my above suggestions, take action to snag your first real estate investment deal if new or add to your existing holdings if you have prior experience.Don't get caught up in analysis paralysis.You must immerse yourself in the RE marketplace locally in your neighborhood or afar if the situation warrants it.Take calculated risks if needed and you shall be rewarded!"

And I hate investing in Chicago.With regard to my LOVE for Chicago, I have 5 data I want to share with you.1)  Volume of Home Sales Have Gone Up in the Past 3 Years 2)  Housing Supply Has Been on the Decline in the Past 4 Years 3)  Foreclosure Filings, An Inverse Leading Indicator of Price Movement, Has Been on the Decline in the Past 4 Years 4)  What's Cool About the Increase in Sales, Decline in Inventory and Decline in Foreclosure Filings is that All These Are Backed By JOB GROWTH In the Past 4 Years 5)  As Can Be Seen in the Case Schiller Index, Over the Next Few Years, We Should See Price Appreciation in ChicagoSO why do I LOVE investing in Chicago?

During that time period almost no one came up with the cash, so these should pretty much all be loan mods (though some will be tagged in error as it is hard to get this particular type of data model perfect).

Those sites price estimates are not accurate, but any sold data that they collect should be.

I figured a practical use could be to have them analyze markets, find contractors in your area, find comps, and other data intense jobs.

Does anyone have a generic chart to record data?

They have lots of demographic data that is helpful in evaluating an area.Lake Olympia  http://www.city-data.com/zips/77479.htmlSienna Plantation http://www.city-data.com/zips/77459.html1)  Before all these nice housing developments moved in, Missouri City was a somewhat low income area.  

IE under 50k and under 5k or next to free. so when you have a wholesaler buy a home for 5k and flip it for 10k that skewes the data.. there are literally thousands of those homes avalaible .. other areas you just simply do not have the product to flip