Understanding comps from a buyers perspective - at this level you really need to get off the computer and go look at houses.

Use the Excel functions I listed above to compute the exact values.

I have written estimating applications for my own use but they were for desk tops.

@Derek Tyler - the key is to find a computer programmer (like a college kid), and have him write some scripts to compile all the data, and then export it into a excel sheet or build a simple tool to analyze the data.Years back I wrote a script for someone that crawled local court cases (via a RSS feed) that were people with homes that were about to be foreclosed on and put them into a excel file - instead of hours of sorting through the data after a few simple clicks what took days could be done in seconds.

Foreclosure prices wont help the area but a true comp is about being like in kind.While in NY an agent give me a desktop appraisal on a property I was selling.

@Bill Pohl, I love rentpayment dot com's mobile optimization and broad spectrum of payment options; it seems to provide easy access for everyone, whether they do business from their mobile device or desktop.    

Your allocations of each payment to principal and interest will be incorrect, your APR will not be very easy to compute within the required tolerance, less than one eighth (.125) of one per cent and there is no tolerance for finance charges.

My "friend" is my mom's boyfriend who's in his 70s and has never used a computer.  

Thank you  Trey,With today's diversions; iPad, Cell phone, computers and the internet, people are not going to the streets to find deals.

I told most folks here on BG and in many seminars that if I sit at computer long enough I can dig a lot of great information up to prove what a great city Charlotte is.