A Preliminary Test of the Coal Mine Rating Schedule of the Associated Companies

The present paper is not designed as an original contribution to the theory of schedule rating, nor even as a critical discussion of the particular schedule rating plan here under review. It professes to do no more than present the salient results of that plan as revealed by the first inspection of coal mines in Pennsylvania. The interest of these results lies in the novelty of the plan itself, and in the fact that similar statistics relative thereto have not heretofore been published.