ASHRAE Inverse Modeling Toolkit: ASHRAE Inverse Modeling Toolkit is a FORTRAN 90 application that identifies best-fit regression models for measuring retrofit savings in buildings. The toolkit was developed under ASHRAE TRP-1050 by the University of Dayton and Texas A&M University. The toolkit supports ASHRAE GPC-14P, the protocol being developed by ASHRAE for measuring retrofit savings. The models include:

Mean models

Simple and multivariable linear regression models

3-parameter multivariable heating and cooling models

4-parameter multivariable models

5-parameter multivariable models

Heating and cooling variable-base degree-day models

For availability see ASHRAE at http://www.ashrae.org/publications.