CSEMP assessment of lead 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 | -3.43 | -1.18 | 4.72 | -9.43 | | | |
| linear | 2 | -4.54 | 0.03 | 6.27 | -12.54 | 3.107 | 1 | 0.0779 |
| smooth (df = 2) | 3 | -6.69 | 1.65 | 8.34 | -16.69 | 4.145 | 1 | 0.0418 |
| smooth (df = 3) | 4 | -6.14 | 8.26 | 9.07 | -18.14 | 1.454 | 1 | 0.2278 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2003 | 2017 | 3.447 | 3.051 | -0.3962 | 0.2046 | -1.936 | 0.0848 |
| last 20 years | 2003 | 2017 | 3.447 | 3.051 | -0.3962 | 0.2046 | -1.936 | 0.0848 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 21.14 | 38.00 | 0.5866 | 0.1127 | 5.203 | 0.0003 |
| ERL | 21.14 | 47.00 | 0.7992 | 0.1127 | 7.089 | <0.0001 |
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
