CSEMP assessment of chromium 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 | 12.93 | 15.50 | -3.46 | 6.93 | |||
| linear | 2 | 13.13 | 18.46 | -2.56 | 5.13 | 1.803 | 1 | 0.1793 |
| smooth (df = 2) | 3 | 13.57 | 23.57 | -1.78 | 3.57 | 1.559 | 1 | 0.2119 |
| smooth (df = 3) | 4 | 14.86 | 32.86 | -1.43 | 2.86 | 0.702 | 1 | 0.4021 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2006 | 2016 | 4.446 | 4.235 | -0.21174 | 0.14475 | -1.463 | 0.1817 |
| last 20 years | 2006 | 2016 | 4.446 | 4.235 | -0.21174 | 0.14475 | -1.463 | 0.1817 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| ERL | 69.04 | 81.00 | 0.15972 | 0.06897 | 2.316 | 0.0246 |
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 : Chromium
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Chromium
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020