Note on Computation of Bi-Serial Correlations in Item Evaluation
Jack W. Dunlap · Psychometrika · 1936
By the use of an algebraic variant of the ordinary formula for bi-serial correlation, tables, and graphic devices, a time-saving systematic procedure for the computation of bi-serial correlation co-efficients is outlined for application to the evaluation of items of a test. A table of for arguments of p =.000 to p =.999 is given.