CSEMP assessment of benzo[a]anthracene in sediment at middle (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
| Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
|---|---|---|---|---|---|---|---|---|
| mean | 1 | 55.98 | 58.23 | -24.99 | 49.98 | |||
| linear | 2 | 56.69 | 61.26 | -24.35 | 48.69 | 1.292 | 1 | 0.2556 |
| smooth (df = 2) | 3 | 58.43 | 66.76 | -24.21 | 48.43 | 0.265 | 1 | 0.6070 |
| smooth (df = 3) | 4 | 49.41 | 63.81 | -18.71 | 37.41 | 11.012 | 1 | 0.0009 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2006 | 2018 | 4.370 | 4.114 | -0.25620 | 0.20517 | -1.249 | 0.2433 |
| last 20 years | 2006 | 2018 | 4.370 | 4.114 | -0.25620 | 0.20517 | -1.249 | 0.2433 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 61.16 | 16.00 | -1.3409 | 0.1233 | -10.871 | 1.0000 |
| ERL | 61.16 | 261.00 | 1.4510 | 0.1233 | 11.764 | <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 (< 63 micron fraction)
Station : Firth_of_Clyde_(middle)_seSF, middle (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_(middle)_seSF, middle (Firth of Clyde)
Determinand : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020