CSEMP assessment of cadmium 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 | 87.79 | 89.29 | -40.89 | 81.79 | |||
| linear | 2 | 85.23 | 88.14 | -38.61 | 77.23 | 4.561 | 1 | 0.0327 |
| smooth (df = 2) | 3 | 80.72 | 85.72 | -35.36 | 70.72 | 6.509 | 1 | 0.0107 |
| smooth (df = 3) | 4 | 76.97 | 84.97 | -32.48 | 64.97 | 5.752 | 1 | 0.0165 |
| smooth (df = 4) | 5 | 78.03 | 90.28 | -32.02 | 64.03 | 0.936 | 1 | 0.3333 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2002 | 2017 | -1.6874 | -1.6986 | -0.01119 | 0.26041 | -0.043 | 0.9665 |
| last 20 years | 2002 | 2017 | -1.6874 | -1.6986 | -0.01119 | 0.26041 | -0.043 | 0.9665 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 0.1829 | 0.3100 | 0.5274 | 0.1542 | 3.420 | 0.0029 |
| ERL | 0.1829 | 1.2000 | 1.8809 | 0.1542 | 12.199 | <0.0001 |
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 : Cadmium
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : Cadmium
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020