A total of 94 ninth and tenth grade students participated in a study to determine which of the following six reading expectancy formulas predict actual reading achievement of secondary school students of average intelligence: the Dechant formula, the Harris I formula, the Science Research Associates'"Tests of General Ability," the Harris II formula, the Los Angeles formula, and the Bond and Tinker formula. Reading achievement scores and intelligence scores were obtained for all students. Each of the six reading expectancy scores was then correlated with the observed reading scores of each student, using the Pearson product-moment correlation coefficient. Each score was then correlated with every other expectancy score to determine the intercorrelation of the formulas. The results revealed that, at a particular grade level, no one formula predicted reading achievement better than any other. In addition, it was found that the correlation between the formulas was extremely high, indicating that they were essentially assessing the same phenomena. (Author/FL)