Some Statistical Operations on the Counting Sorter
Philip H. DuBois · Psychometrika · 1941
The IBM card counting sorter may be readily used for a number of statistical operations independent of the tabulating unit. In this article, use of the counting sorter in computing the mean and standard deviation with 2-digit variables and the coefficient of correlation with scores coded in a single column will be described. Both processes involve machine work which is essentially the same. A method for finding the correlation between 2-digit variables will also be given.