CSEMP assessment of lead in sediment at Sea of Hebrides
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 97.67 | 99.67 | -45.83 | 91.67 | | | |
| linear | 2 | 99.54 | 103.54 | -45.77 | 91.54 | 0.133 | 1 | 0.7151 |
| smooth (df = 2) | 3 | 101.43 | 108.57 | -45.71 | 91.43 | 0.110 | 1 | 0.7400 |
| smooth (df = 3) | 4 | 98.05 | 110.05 | -43.03 | 86.05 | 5.374 | 1 | 0.0204 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2017 | 3.473 | 3.561 | 0.08818 | 0.24095 | 0.366 | 0.7220 |
| last 20 years | 2006 | 2017 | 3.473 | 3.561 | 0.08818 | 0.24095 | 0.366 | 0.7220 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 35.19 | 38.00 | 0.07674 | 0.14010 | 0.548 | 0.2979 |
| ERL | 35.19 | 47.00 | 0.28930 | 0.14010 | 2.065 | 0.0329 |
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
