CSEMP assessment of mercury in sediment at inner (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
| Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
|---|---|---|---|---|---|---|---|---|
| mean | 1 | 83.29 | 84.58 | -38.65 | 77.29 | |||
| linear | 2 | 71.93 | 74.40 | -31.97 | 63.93 | 13.358 | 1 | 0.0003 |
| smooth (df = 2) | 3 | 73.82 | 77.98 | -31.91 | 63.82 | 0.119 | 1 | 0.7298 |
| smooth (df = 3) | 4 | 75.80 | 82.35 | -31.90 | 63.80 | 0.015 | 1 | 0.9014 |
| smooth (df = 4) | 5 | 77.76 | 87.56 | -31.88 | 63.76 | 0.041 | 1 | 0.8389 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 1999 | 2016 | -0.4451 | -0.9776 | -0.5325 | 0.1208 | -4.410 | 0.0005 |
| last 20 years | 1999 | 2016 | -0.4451 | -0.9776 | -0.5325 | 0.1208 | -4.410 | 0.0005 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 0.3762 | 0.0700 | -1.6816 | 0.0687 | -24.480 | 1.0000 |
| ERL | 0.3762 | 0.1500 | -0.9195 | 0.0687 | -13.385 | 1.0000 |
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_(inner)_seSF, inner (Firth of Clyde)
Determinand : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(inner)_seSF, inner (Firth of Clyde)
Determinand : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020