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130+
Tall Fescue Cultivars
50+
Performance Metrics
25+
Test Locations
5+
Years of Trials
What is the Turf Performance Index (TPI)?
The Turf Performance Index is a ranking metric that measures how consistently a cultivar appears in the top statistical performance group across multiple metrics.
Unlike simple averages, TPI accounts for statistical significance using LSD (Least Significant Difference) values from NTEP trials. This means small numeric differences that aren't statistically meaningful don't affect the ranking.
Formula: TPI = (Top Group Appearances) / (Total Metrics Evaluated)