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Frequently Asked Question - Why do cells in the trend/ threshold indicator matrix sometimes switch to grey?

Why do cells in the trend/ threshold indicator matrix sometimes switch to grey?

Cells in the trend/ threshold indictor matrix will switch to grey in the event that the concentration trend cannot be calculated because there is insufficient data, or if confidence in the trend smoother estimate is poor. Regions of poor confidence in the trend fit are indicated where the trend smoother and 95% confidence limit curves are coloured grey, rather than blue, on the well trend plot. Regions of poor confidence are defined as where the upper 95% confidence limit (dashed blue/ grey line) exceeds 10x the trend fit value (solid blue line). 

CL:AIRE will not be responsible for any loss, however arising, from the use of, or reliance on, the information contained in the responses above, nor do they assume responsibility or liability for errors or omissions in the information provided. Readers are advised to use the information contained herein purely as a guide and to take appropriate professional advice where necessary.