University of California Press

Table 3

Mann-Kendall and linear regression applied to annual 95^th percentile at the Look Rock, TN site. DOI: https://doi.org/10.1525/elementa.279.t3

Method

Time period

Number of valid years

Trend estimate (ppb/yr)

p-value

Lower 95% conf. limit (ppb/yr)

Upper 95% conf. limit (ppb/yr)

R² (%)

Mann-Kendall

1990–2013

–0.31

0.0866

–0.84

regression

1990–2013

–0.36

0.0770

–0.77

0.04

Method	Time period	Number of valid years	Trend estimate (ppb/yr)	p-value	Lower 95% conf. limit (ppb/yr)	Upper 95% conf. limit (ppb/yr)	R² (%)

Mann-Kendall	1990–2013	24	–0.31	0.0866	–0.84	0	NA
regression	1990–2013	24	–0.36	0.0770	–0.77	0.04	14