CSEMP assessment of arsenic in sediment at outer (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 44.72 | 46.10 | -19.36 | 38.72 | |||
linear | 2 | 44.09 | 46.75 | -18.04 | 36.09 | 2.631 | 1 | 0.1048 |
smooth (df = 2) | 3 | 42.82 | 47.36 | -16.41 | 32.82 | 3.268 | 1 | 0.0707 |
smooth (df = 3) | 4 | 44.82 | 52.02 | -16.41 | 32.82 | 0.000 | 1 | 0.9866 |
smooth (df = 4) | 5 | 46.73 | 57.62 | -16.36 | 32.73 | 0.091 | 1 | 0.7630 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2016 | 2.4068 | 2.0855 | -0.3213 | 0.1900 | -1.691 | 0.1129 |
last 20 years | 2000 | 2016 | 2.4068 | 2.0855 | -0.3213 | 0.1900 | -1.691 | 0.1129 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 8.048 | 25.000 | 1.1334 | 0.1134 | 9.999 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in sediment
- Accessment criteria for metals in sediment
Media : Sediment (unsieved)
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020