System and method for parameter evaluation

The described implementations relate to machine learning. One implementation provides a technique involving logging data that includes outcomes and values of first and second parameters that are associated with the outcomes. The technique can also include determining an equation that includes a first coefficient for the first parameter and a second coefficient for the second parameter, normalizing the first coefficient based on the values of the first parameter, and normalizing the second coefficient based on the values of the second parameter. The first parameter and the second parameter can be ranked in order of contribution to the outcomes based on the normalized first and second coefficients.