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ARS Home » Midwest Area » Madison, Wisconsin » U.S. Dairy Forage Research Center » Research » Publications at this Location » Publication #62324
Title: NEW APPROACH FOR NFTA LABORATORY CERTIFICATION

Author
item THIEX, NANCY - SD STATE UNIV, BROOKINGS
item MARTIN, NEAL - UNIV OF MINNESOTA
item Mertens, David
item WALKER, CRAIG - SERVI-TECH LAB, KS

Submitted to: National Forage Testing Association
Publication Type: Proceedings
Publication Acceptance Date: 6/1/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: New Certification Standards and Statistics for 1995 NFTA Certification were described at the 1994 NFTA Workshop in Columbia, MO. These have been implemented and data are now available from two 1995 check samples, one alfalfa hay and one corn silage. Certification is based on a grade (A, B, C, D, or, F) for each analyte which is determined by the bias of the laboratory's average value when compared to a Reference Method Average (RMA). The range which is acceptable for each grade is based on the Horwitz Standard Deviation (HSD) of the RMA. These statistics and standards will be reviewed. Results of the laboratories performance from the first two samples will be discussed, including the number of laboratories included in the RMA calculation after removal of outliers; the standard deviation and relative standard of RMA laboratories as compared to all laboratories; the HSD and relative HSD for RMA laboratories; and the grade distribution of laboratories. In addition, any trends or observations of interest will be discussed.