CSEMP assessment of lead in biota at Crosby (Mersey Channel)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 3.58 | 5.83 | 1.21 | -2.42 | | | |
| linear | 2 | 4.31 | 8.88 | 1.84 | -3.69 | 1.267 | 1 | 0.2604 |
| smooth (df = 2) | 3 | 1.10 | 9.43 | 4.45 | -8.90 | 5.216 | 1 | 0.0224 |
| smooth (df = 3) | 4 | -1.57 | 12.83 | 6.79 | -13.57 | 4.670 | 1 | 0.0307 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2000 | 2018 | 7.324 | 6.958 | -0.3663 | 0.3176 | -1.153 | 0.2786 |
| last 20 years | 2000 | 2018 | 7.324 | 6.958 | -0.3663 | 0.3176 | -1.153 | 0.2786 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 1051.6 | 211.9 | -1.6019 | 0.1749 | -9.157 | 1.0000 |
| EC | 1051.6 | 1500.0 | 0.3552 | 0.1749 | 2.030 | 0.0364 |
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
