A positive value for τ indicates an increasing trend over time whilst a negative τ indicates a decreasing trend.
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Cancer Trends in West Bengal Over 25 Years: A Comprehensive Single-Centre Study.
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The sentences
Furthermore, a magnitude of τ near zero indicated a weak trend, whilst values nearer 1 or − 1 indicated a stronger trend.
A positive value for τ indicates an increasing trend over time whilst a negative τ indicates a decreasing trend.