Alvord, GregoryMacready, George B.2011-06-162011-06-161985Alvord, Gregory & Macready, George B. (1985). Comparing fit of nonsubsuming probability models. Applied Psychological Measurement, 9, 233-240. doi:10.1177/014662168500900301doi:10.1177/014662168500900301https://hdl.handle.net/11299/107572A "mixture" probability model that incorporates two component models defined by nonsubsuming sets of parameters is introduced, and a strategy for using this model in the selection of a preferred component model is developed. Example applications of the suggested strategy are considered for the special case in which the Rasch item response model and a Latent State Mastery model are the component models compared. Simulated data sets generated under each of these models were used to provide example applications of the proposed model selection strategy.enArticle