CSEMP assessment of benzo[a]anthracene 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 | 115.19 | 116.47 | -54.59 | 109.19 | |||
linear | 2 | 109.48 | 111.94 | -50.74 | 101.48 | 7.707 | 1 | 0.0055 |
smooth (df = 2) | 3 | 104.05 | 108.22 | -47.03 | 94.05 | 7.424 | 1 | 0.0064 |
smooth (df = 3) | 4 | 105.88 | 112.43 | -46.94 | 93.88 | 0.173 | 1 | 0.6772 |
smooth (df = 4) | 5 | 104.17 | 113.97 | -45.08 | 90.17 | 3.713 | 1 | 0.0540 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | 4.361 | 3.644 | -0.7171 | 0.1980 | -3.622 | 0.0028 |
last 20 years | 2000 | 2017 | 4.361 | 3.644 | -0.7171 | 0.1980 | -3.622 | 0.0028 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 38.25 | 16.00 | -0.8715 | 0.1649 | -5.285 | 0.9999 |
ERL | 38.25 | 261.00 | 1.9204 | 0.1649 | 11.645 | <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 : Benzo[a]anthracene
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 : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020