This strategy gives the professional the ability to build in a static estimate for a variable(s) into the statistical model+_. This option is wonderful in rural markets where data may be limited, but the ability to solve for primary drivers such as Lot Size per sq. ft. can be easily sourced by analyzing land sales. In other cases, such as bathrooms, data can be uncooperative and not render credible adjustment estimates. In those times, it may be prudent to insert a depreciated cost estimate for a bathroom and build it into the statistical model.
See the Knowledgebase article Solution Strategies for more detail.