EVALUATION OF STATE CENTRAL MILK LABORATORIES BY STATISTICAL ANALYSES OF STANDARD PLATE COUNTS

1 January 1966

journal article
research article
Published by International Association for Food Protection in Journal of Milk and Food Technology

Vol. 29 (1) , 19-24
https://doi.org/10.4315/0022-2747-29.1.19

Abstract

Standard plate counts reported by analysts in 54 state central laboratories for "normal" milk samples sent out in 1961, 1962, and 1963 revealed that an incubation temperature of 32 C produced more colonies than 35 C, and that the overall variance, g2, of counts for any sample should not greatly exceed 0.012. Based on this variance, s2 = 0.012, 80% of the analysts should agree within 1.3 standard deviations of the logarithmic mean of 75% of the normal samples. A method for detecting outliers and judging the performance of individual analysts is described.

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