JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact email@example.com. . International Biometric Society is collaborating with JSTOR to digitize, preserve and extend access to Biometrics. SUMMARY A model is suggested for certain types of experiments that involve individuals being selected one-by-one from a population consisting of two or more different classes of individuals. Selection with and without replacement is considered and equations are provided for the estimation of the selectivity of the selection process. The equations are illustrated on data from experiments involving selective predation and food competition.
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