CSEMP assessment of benzo[a]anthracene in sediment at inner (Firth of Forth)
Statistical analysis
Trend assessment
Analysis of variance
| Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
|---|---|---|---|---|---|---|---|---|
| mean | 1 | 93.89 | 95.89 | -43.94 | 87.89 | |||
| linear | 2 | 87.83 | 91.83 | -39.92 | 79.83 | 8.053 | 1 | 0.0045 |
| smooth (df = 2) | 3 | 88.24 | 95.38 | -39.12 | 78.24 | 1.593 | 1 | 0.2069 |
| smooth (df = 3) | 4 | 90.21 | 102.21 | -39.10 | 78.21 | 0.034 | 1 | 0.8543 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 1999 | 2018 | 5.332 | 4.006 | -1.3263 | 0.3928 | -3.377 | 0.0070 |
| last 20 years | 1999 | 2018 | 5.332 | 4.006 | -1.3263 | 0.3928 | -3.377 | 0.0070 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 54.91 | 16.00 | -1.2330 | 0.2588 | -4.764 | 0.9996 |
| ERL | 54.91 | 261.00 | 1.5589 | 0.2588 | 6.024 | <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_Forth_(inner)_seSF, inner (Firth of Forth)
Determinand : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Forth_(inner)_seSF, inner (Firth of Forth)
Determinand : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020