CSEMP assessment of zinc in sediment at Lough Foyle
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 19.41 | 21.41 | -6.70 | 13.41 | | | |
| linear | 2 | 17.53 | 21.53 | -4.77 | 9.53 | 3.873 | 1 | 0.0491 |
| smooth (df = 2) | 3 | 17.96 | 25.10 | -3.98 | 7.96 | 1.573 | 1 | 0.2098 |
| smooth (df = 3) | 4 | 19.87 | 31.87 | -3.94 | 7.87 | 0.089 | 1 | 0.7659 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2003 | 2018 | 4.938 | 4.438 | -0.5005 | 0.2334 | -2.144 | 0.0576 |
| last 20 years | 2003 | 2018 | 4.938 | 4.438 | -0.5005 | 0.2334 | -2.144 | 0.0576 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 84.57 | 122.00 | 0.3664 | 0.1260 | 2.907 | 0.0078 |
| ERL | 84.57 | 150.00 | 0.5730 | 0.1260 | 4.546 | 0.0005 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in sediment
- Accessment criteria for metals in sediment
