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 | 6.24 | 8.81 | -0.12 | 0.24 | | | |
| linear | 2 | 6.82 | 12.16 | 0.59 | -1.18 | 1.414 | 1 | 0.2344 |
| smooth (df = 2) | 3 | 4.40 | 14.40 | 2.80 | -5.60 | 4.421 | 1 | 0.0355 |
| smooth (df = 3) | 4 | -1.67 | 16.33 | 6.83 | -13.67 | 8.070 | 1 | 0.0045 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2000 | 2017 | 7.350 | 6.927 | -0.4231 | 0.3450 | -1.227 | 0.2548 |
| last 20 years | 2000 | 2017 | 7.350 | 6.927 | -0.4231 | 0.3450 | -1.227 | 0.2548 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 1019.7 | 211.9 | -1.5712 | 0.1943 | -8.084 | 1.0000 |
| EC | 1019.7 | 1500.0 | 0.3859 | 0.1943 | 1.986 | 0.0412 |
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
