CSEMP assessment of nickel 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 | -30.02 | -28.63 | 18.01 | -36.02 | |||
linear | 2 | -40.39 | -37.73 | 24.20 | -48.39 | 12.376 | 1 | 0.0004 |
smooth (df = 2) | 3 | -57.01 | -52.46 | 33.50 | -67.01 | 18.613 | 1 | <0.0001 |
smooth (df = 3) | 4 | -57.40 | -50.20 | 34.70 | -69.40 | 2.399 | 1 | 0.1214 |
smooth (df = 4) | 5 | -55.67 | -44.78 | 34.83 | -69.67 | 0.262 | 1 | 0.6089 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2016 | 4.448 | 3.582 | -0.8656 | 0.1213 | -7.134 | <0.0001 |
last 20 years | 2000 | 2016 | 4.448 | 3.582 | -0.8656 | 0.1213 | -7.134 | <0.0001 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 35.96 | 36.00 | 0.00109 | 0.10134 | 0.011 | 0.4958 |
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 : Nickel
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 : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020