I always put days on market in my grid. It gives support for my exposure time. It can also help. It helped today. I appraised a property where a pending sale was under contract for $206,000 and an identical one was under contract for $240,000. The agent of the first said he had a hard time pricing the house. His time on market was about 30 days, so I thought, okay maybe he priced it low. The other sale at $240,000 came on the market right after his contracted, and then contracted within 18 days. (Total historic time, not just for those particular agents). It gave me support that the $208,000 price was below market.
For list price sale price ratios I don't normally make adjustments but just explain why I don't. I have a standard comment at the bottom of my additional comps page; and I have never (knock knock) been given a stip to make the adjustments.
List price to sale price ratio adjustments are not made. According to the statistical "Law of Large Numbers" applying the list price ratio adjustment to an average list price of a large pool of data can converge on a reliable average sales price for that sample group; however, applying the ratio to any single datum within the pool will provide less reliable results. Therefore, the listings above are to show the upper level of the market. They are not weighted.