CSEMP assessment of zinc 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 | 5.88 | 7.26 | 0.06 | -0.12 | |||
| linear | 2 | -5.04 | -2.38 | 6.52 | -13.04 | 12.918 | 1 | 0.0003 |
| smooth (df = 2) | 3 | -16.09 | -11.55 | 13.05 | -26.09 | 13.053 | 1 | 0.0003 |
| smooth (df = 3) | 4 | -16.21 | -9.01 | 14.11 | -28.21 | 2.116 | 1 | 0.1458 |
| smooth (df = 4) | 5 | -14.28 | -3.39 | 14.14 | -28.28 | 0.072 | 1 | 0.7882 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2000 | 2016 | 5.677 | 4.669 | -1.0089 | 0.1493 | -6.757 | <0.0001 |
| last 20 years | 2000 | 2016 | 5.677 | 4.669 | -1.0089 | 0.1493 | -6.757 | <0.0001 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 106.54 | 122.00 | 0.1355 | 0.1210 | 1.120 | 0.1416 |
| ERL | 106.54 | 150.00 | 0.3421 | 0.1210 | 2.827 | 0.0071 |
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 : Zinc
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 : Zinc
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020