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 | -4.93 | -2.93 | 5.47 | -10.93 | | | |
| linear | 2 | -9.40 | -5.40 | 8.70 | -17.40 | 6.463 | 1 | 0.0110 |
| smooth (df = 2) | 3 | -13.28 | -6.13 | 11.64 | -23.28 | 5.881 | 1 | 0.0153 |
| smooth (df = 3) | 4 | -12.71 | -0.71 | 12.35 | -24.71 | 1.432 | 1 | 0.2314 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2003 | 2018 | 3.231 | 2.755 | -0.4758 | 0.1589 | -2.994 | 0.0151 |
| last 20 years | 2003 | 2018 | 3.231 | 2.755 | -0.4758 | 0.1589 | -2.994 | 0.0151 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 15.72 | 38.00 | 0.8826 | 0.1040 | 8.491 | <0.0001 |
| ERL | 15.72 | 47.00 | 1.0952 | 0.1040 | 10.535 | <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
