CSEMP assessment of lead in sediment at Forth Estuary
Statistical analysis
Trend assessment
Analysis of variance
| Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
|---|---|---|---|---|---|---|---|---|
| mean | 1 | 75.33 | 76.53 | -34.66 | 69.33 | |||
| linear | 2 | 77.12 | 79.40 | -34.56 | 69.12 | 0.211 | 1 | 0.6457 |
| smooth (df = 2) | 3 | 78.96 | 82.80 | -34.48 | 68.96 | 0.162 | 1 | 0.6874 |
| smooth (df = 3) | 4 | 80.86 | 86.86 | -34.43 | 68.86 | 0.092 | 1 | 0.7616 |
| smooth (df = 4) | 5 | 82.08 | 90.99 | -34.04 | 68.08 | 0.779 | 1 | 0.3775 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2000 | 2017 | 4.159 | 4.225 | 0.06591 | 0.14341 | 0.460 | 0.6520 |
| last 20 years | 2000 | 2017 | 4.159 | 4.225 | 0.06591 | 0.14341 | 0.460 | 0.6520 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 68.35 | 38.00 | -0.5871 | 0.0861 | -6.818 | 1.0000 |
| ERL | 68.35 | 47.00 | -0.3745 | 0.0861 | -4.349 | 0.9998 |
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 : Forth_Estuary_seSF (Forth Estuary)
Determinand : Lead
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : Lead
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020