Studies in the learning function

From Thurstone's theoretical learning curve, a solution for the difficulty of the problem and the learning constant of the subject has been developed. The curve is an equilateral hyperbola. Therefore the semi-major axis represents the learning situation in one constant. The vertex of the curve is a point where all of the animals are equated, since they are all making errors at the rate of one error per trial.A grant-in-aid from the National Research Council has made the present analysis possible. We wish to express our appreciation, for the aid and encouragement, of Professor Rufus Crane of the mathematics department, Ohio Wesleyan University and of Professor L. L. Thurstone, University of Chicago.