CSEMP assessment of benzo[a]pyrene 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 | 119.42 | 120.70 | -56.71 | 113.42 | |||
| linear | 2 | 115.07 | 117.53 | -53.53 | 107.07 | 6.350 | 1 | 0.0117 |
| smooth (df = 2) | 3 | 104.72 | 108.89 | -47.36 | 94.72 | 12.344 | 1 | 0.0004 |
| smooth (df = 3) | 4 | 106.50 | 113.04 | -47.25 | 94.50 | 0.226 | 1 | 0.6348 |
| smooth (df = 4) | 5 | 107.36 | 117.16 | -46.68 | 93.36 | 1.141 | 1 | 0.2854 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2000 | 2017 | 4.814 | 4.094 | -0.7202 | 0.1973 | -3.650 | 0.0026 |
| last 20 years | 2000 | 2017 | 4.814 | 4.094 | -0.7202 | 0.1973 | -3.650 | 0.0026 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 60 | 30 | -0.6926 | 0.1653 | -4.191 | 0.9995 |
| ERL | 60 | 430 | 1.9699 | 0.1653 | 11.919 | <0.0001 |
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for in sediment
- Accessment criteria for in sediment
Media : Sediment (unsieved)
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : Benzo[a]pyrene
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]pyrene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020