CSEMP assessment of copper in sediment at middle (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | -10.63 | -8.06 | 8.32 | -16.63 | |||
linear | 2 | -10.39 | -5.05 | 9.19 | -18.39 | 1.752 | 1 | 0.1856 |
smooth (df = 2) | 3 | -20.71 | -10.71 | 15.35 | -30.71 | 12.321 | 1 | 0.0004 |
smooth (df = 3) | 4 | -19.04 | -1.04 | 15.52 | -31.04 | 0.331 | 1 | 0.5650 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2006 | 2016 | 2.8945 | 2.7407 | -0.15384 | 0.11845 | -1.299 | 0.2352 |
last 20 years | 2006 | 2016 | 2.8945 | 2.7407 | -0.15384 | 0.11845 | -1.299 | 0.2352 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 15.5 | 27.0 | 0.5551 | 0.0641 | 8.667 | <0.0001 |
ERL | 15.5 | 34.0 | 0.7857 | 0.0641 | 12.266 | <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 (< 63 micron fraction)
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Copper
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Copper
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020