CSEMP assessment of lead in biota at Roa Island (Morecambe Bay)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 27.42 | 29.42 | -10.71 | 21.42 | | | |
| linear | 2 | 28.17 | 32.17 | -10.08 | 20.17 | 1.247 | 1 | 0.2640 |
| smooth (df = 2) | 3 | 29.64 | 36.78 | -9.82 | 19.64 | 0.534 | 1 | 0.4648 |
| smooth (df = 3) | 4 | 31.31 | 43.31 | -9.66 | 19.31 | 0.325 | 1 | 0.5687 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2015 | 7.026 | 6.766 | -0.25934 | 0.22658 | -1.145 | 0.2790 |
| last 20 years | 1999 | 2015 | 7.026 | 6.766 | -0.25934 | 0.22658 | -1.145 | 0.2790 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 868.1 | 211.9 | -1.4102 | 0.1511 | -9.335 | 1.0000 |
| EC | 868.1 | 1500.0 | 0.5469 | 0.1511 | 3.620 | 0.0023 |
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 biota
- Accessment criteria for metals in biota
