TRACE time-shared routines for analysis, classification and evaluation
Gerald H. Shure, Robert J. Meeker, William H. Moore · 1967
Investigators often find it desirable to collect more data than are required to test preformulated hypotheses. Indeed, the experimenter with an empirical bent is reluctant to forgo the opportunity of collecting any data that might amplify or clarify his understanding. Particularly when anticipated relationships among variables fail to materialize (or, stated less elegantly, when predictions are not confirmed), he will wish to check various possibilities among supplementary data that may account for his negative results.