If you're interested in letting someone else do the recordkeeping for you, analyze their technology and customer service.

Is there a general system or formula to analyze your flips?

Folks looking to become landlords that also want to analyze every number such as the water bills on single family houses right down the dollar may not be in the right business. 

Because of this I would not count loan principle reduction when analyzing a buy and hold deal.

I will walk through the scenario presented above to show how I would analyze this.In this scenario, we have a borrower that is considering paying a higher interest rate to get rid of PMI expense.  

Glad to see you here...Btw, for anyone interested in both the strategic and tactical aspects of analyzing, bidding on and buying large multi-unit properties, Sean is a great resource...as best I can tell, he spends most of his days jet-setting around the country looking at large apartment deals...  :-)

Be patient and analyze a lot of deals but in the end you gotta make some moves!

I made a pretty simple but effective spreadsheet when I first started analyzing deals.

make sure you are always testing and analyzing which keywords are working for your campaigns.  

I've analyzed 40 markets on their economic and demographic trends combined with housing affordability and ROI and both come up very favorably.