CSEMP assessment of mercury 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 | -11.68 | -9.88 | 8.84 | -17.68 | | | |
| linear | 2 | -9.68 | -6.13 | 8.84 | -17.68 | 0.002 | 1 | 0.9623 |
| smooth (df = 2) | 3 | -8.83 | -2.58 | 9.41 | -18.83 | 1.146 | 1 | 0.2844 |
| smooth (df = 3) | 4 | -6.89 | 3.39 | 9.45 | -18.89 | 0.066 | 1 | 0.7971 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2015 | 4.299 | 4.308 | 0.00890 | 0.18938 | 0.047 | 0.9633 |
| last 20 years | 1999 | 2015 | 4.299 | 4.308 | 0.00890 | 0.18938 | 0.047 | 0.9633 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 74.3 | 14.7 | -1.6217 | 0.1228 | -13.212 | 1.0000 |
| EC | 74.3 | 500.0 | 1.9071 | 0.1228 | 15.536 | <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 biota
- Accessment criteria for metals in biota
