Suggested improvements for the Joint Oil Analysis Program Correlation Program

The Joint Oil Analysis Correlation Program is intended to provide a monthly indication of how consistently the various Department of Defense (DOD) oil analysis laboratories are performing. The procedure employed is a modification of one suggested by Youden in 1959; the modification employed does not appear to provide a fair measure for all the types of spectrometers used by DOD. This paper provides a comparison of the current procedure results with those which would occur with Youden's original procedure, and suggests that the latter approach is preferable. Keywords: Interlaboratory testing, Spectrometric oil analysis, Correlation program.