CSEMP assessment of chrysene in sediment at inner (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 147.23 | 148.87 | -70.62 | 141.23 | |||
linear | 2 | 144.10 | 147.30 | -68.05 | 136.10 | 5.129 | 1 | 0.0235 |
smooth (df = 2) | 3 | 146.09 | 151.65 | -68.04 | 136.09 | 0.015 | 1 | 0.9037 |
smooth (df = 3) | 4 | 148.00 | 157.00 | -68.00 | 136.00 | 0.092 | 1 | 0.7617 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2002 | 2018 | 4.655 | 5.865 | 1.2108 | 0.4856 | 2.494 | 0.0282 |
last 20 years | 2002 | 2018 | 4.655 | 5.865 | 1.2108 | 0.4856 | 2.494 | 0.0282 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 352.6 | 20.0 | -2.8697 | 0.2604 | -11.019 | 1.0000 |
ERL | 352.6 | 384.0 | 0.0852 | 0.2604 | 0.327 | 0.3746 |
Raw data with supporting information
Raw data with assessment
Assessment plot
PAH (parent) data
PAH (parent) assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for pah_(parent) in sediment
- Accessment criteria for pah_(parent) in sediment
Media : Sediment (unsieved)
Station : Firth_of_Clyde_(inner)_seSF, inner (Firth of Clyde)
Determinand : Chrysene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(inner)_seSF, inner (Firth of Clyde)
Determinand : Chrysene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020