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Estimates of Coefficient Alpha for Finite Populations of Items

THE notion of well defined, finite populations of item has received increasing interest over the past decade. For example, the literature on item sampling (Lord and Novick, 1968) presents formulas for estimating examinee score variances for matrices sampled from known and finite examinee and/or item populations. Loevinger (1965) has criticized item sampling theory in general indicating that (a) infinite populations of items simply cannot be catalogued and therefore (b) statistically random item samples are not possible. The key word here is infinite. Given that one can accept a cata-