CSEMP assessment of mercury 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 | 35.57 | 37.82 | -14.79 | 29.57 | |||
| linear | 2 | 37.57 | 42.14 | -14.78 | 29.57 | 0.003 | 1 | 0.9530 |
| smooth (df = 2) | 3 | 37.68 | 46.01 | -13.84 | 27.68 | 1.889 | 1 | 0.1693 |
| smooth (df = 3) | 4 | 35.40 | 49.80 | -11.70 | 23.40 | 4.281 | 1 | 0.0385 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2006 | 2017 | -2.2817 | -2.2704 | 0.01130 | 0.19094 | 0.059 | 0.9541 |
| last 20 years | 2006 | 2017 | -2.2817 | -2.2704 | 0.01130 | 0.19094 | 0.059 | 0.9541 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 0.10327 | 0.07000 | -0.3889 | 0.0967 | -4.021 | 0.9985 |
| ERL | 0.10327 | 0.15000 | 0.3733 | 0.0967 | 3.859 | 0.0019 |
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 : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 27 June 2019
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 27 June 2019
