You mean for my market analysis? If so, not really.
I use Spark and I throw out two Nets to capture data. The first is "competitive" sales which are "similar" to the subject property in terms of location and physical characteristics. These would appeal to the market participants considering the subject property. Then "all" the sales within the market. I remove outliers from both sets of data.
Sometimes, you just don't have enough competitive sales to make a market determination thus, I use the data from all the sales. Also, unless I'm going to get poked and prodded for it, I'm not going to do separate percentage adjustments for each and every sale. That is, unless I'm using a dated sale of 18 to 24 months back in time.