CSEMP assessment of lead 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 | 58.38 | 59.77 | -26.19 | 52.38 | |||
| linear | 2 | 51.94 | 54.60 | -21.97 | 43.94 | 8.445 | 1 | 0.0037 |
| smooth (df = 2) | 3 | 48.79 | 53.34 | -19.40 | 38.79 | 5.144 | 1 | 0.0233 |
| smooth (df = 3) | 4 | 49.48 | 56.68 | -18.74 | 37.48 | 1.312 | 1 | 0.2519 |
| smooth (df = 4) | 5 | 49.68 | 60.57 | -17.84 | 35.68 | 1.800 | 1 | 0.1797 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2000 | 2016 | 4.590 | 3.599 | -0.9900 | 0.2748 | -3.603 | 0.0032 |
| last 20 years | 2000 | 2016 | 4.590 | 3.599 | -0.9900 | 0.2748 | -3.603 | 0.0032 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 36.58 | 38.00 | 0.03809 | 0.23379 | 0.163 | 0.4365 |
| ERL | 36.58 | 47.00 | 0.25065 | 0.23379 | 1.072 | 0.1516 |
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 : Lead
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : Lead
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020