Turf & Rec

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NTEP increases accuracy of turfgrass data collection


May 12, 2009
By Mike Jiggens

The National Turfgrass Evaluation Program (NTEP), headquartered in Beltsville, Md., has instituted a new statistical procedure,
Additive Main Effect and Multiplicative Interaction (AMMI), which it
claims will increase the accuracy of the data it collects from its
nationwide network of turfgrass trials.

AMMI was developed and
tested by statisticians at the University of Massachusetts and Cornell
University over the last 15 years. In contrast, the statistical
procedure NTEP has been using since its inception, Analysis of Variance
(ANOVA), has been used for statistical analysis of agricultural
experiments since the 1930's. FULL STORY