Abstract: Given processes that assign binary vectors to data, one wish to test models that simulate those processes and uncover groupings in the processes. It is shown that a suitable test can be derived from a kappa type agreement measure. This is applied to analyze stress placement in spoken phrases, based on experimental data previously obtained. The processes were Portuguese speakers and the grouping corresponds to the Brazilian and European varieties of that language. Optimality Theory gave rise to different models. The agreement measure was successful in pointing the relative fitness of models to language varieties.