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Table 2

Comparison of the Mann-Kendall and linear regression applied to annual fourth highest daily maximum 8-h level using data from a site at Harwell, UK. DOI: https://doi.org/10.1525/elementa.279.t2

MethodTime periodNumber of valid yearsTrend estimate (ppb/yr)p-valueLower 95% conf. limit (ppb/yr)Upper 95% conf. limit (ppb/yr)R2 (%)

 
Mann-Kendall 1984–2013 27 –0.86 0.0005 –1.69 –0.36 NA 
regression 1984–2013 27 –0.92 0.0010 –1.42 –0.41 36 
MethodTime periodNumber of valid yearsTrend estimate (ppb/yr)p-valueLower 95% conf. limit (ppb/yr)Upper 95% conf. limit (ppb/yr)R2 (%)

 
Mann-Kendall 1984–2013 27 –0.86 0.0005 –1.69 –0.36 NA 
regression 1984–2013 27 –0.92 0.0010 –1.42 –0.41 36 
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