CSEMP assessment of dibenzothiophene 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 | 90.71 | 92.09 | -42.35 | 84.71 | |||
linear | 2 | 85.67 | 88.33 | -38.83 | 77.67 | 7.039 | 1 | 0.0080 |
smooth (df = 2) | 3 | 76.40 | 80.95 | -33.20 | 66.40 | 11.262 | 1 | 0.0008 |
smooth (df = 3) | 4 | 78.37 | 85.57 | -33.19 | 66.37 | 0.034 | 1 | 0.8541 |
smooth (df = 4) | 5 | 79.18 | 90.07 | -32.59 | 65.18 | 1.189 | 1 | 0.2755 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | 2.6640 | 1.8669 | -0.7971 | 0.2048 | -3.892 | 0.0019 |
last 20 years | 2000 | 2017 | 2.6640 | 1.8669 | -0.7971 | 0.2048 | -3.892 | 0.0019 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
ERL | 6.47 | 190.00 | 3.380 | 0.171 | 19.822 | <0.0001 |
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_(outer)_seSF, outer (Firth of Clyde)
Determinand : Dibenzothiophene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : Dibenzothiophene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020