CSEMP assessment of nickel 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 | -34.53 | -31.95 | 20.26 | -40.53 | |||
linear | 2 | -33.41 | -28.07 | 20.70 | -41.41 | 0.881 | 1 | 0.3479 |
smooth (df = 2) | 3 | -39.64 | -29.64 | 24.82 | -49.64 | 8.237 | 1 | 0.0041 |
smooth (df = 3) | 4 | -38.05 | -20.05 | 25.02 | -50.05 | 0.402 | 1 | 0.5259 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2006 | 2016 | 3.772 | 3.655 | -0.11738 | 0.11613 | -1.011 | 0.3417 |
last 20 years | 2006 | 2016 | 3.772 | 3.655 | -0.11738 | 0.11613 | -1.011 | 0.3417 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 38.65 | 36.00 | -0.07111 | 0.05576 | -1.275 | 0.8810 |
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 : Nickel
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 : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020