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 | 80.17 | 82.42 | -37.09 | 74.17 | | | |
| linear | 2 | 82.03 | 86.60 | -37.01 | 74.03 | 0.145 | 1 | 0.7030 |
| smooth (df = 2) | 3 | 81.45 | 89.78 | -35.72 | 71.45 | 2.580 | 1 | 0.1082 |
| smooth (df = 3) | 4 | 82.35 | 96.75 | -35.18 | 70.35 | 1.094 | 1 | 0.2957 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2016 | 3.531 | 3.440 | -0.09095 | 0.23796 | -0.382 | 0.7112 |
| last 20 years | 2006 | 2016 | 3.531 | 3.440 | -0.09095 | 0.23796 | -0.382 | 0.7112 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 31.19 | 38.00 | 0.1974 | 0.1384 | 1.426 | 0.0937 |
| ERL | 31.19 | 47.00 | 0.4100 | 0.1384 | 2.962 | 0.0079 |
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
