CSEMP assessment of arsenic 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 | 245.06 | 247.06 | -119.53 | 239.06 | | | |
| linear | 2 | 244.48 | 248.48 | -118.24 | 236.48 | 2.579 | 1 | 0.1083 |
| smooth (df = 2) | 3 | 246.35 | 253.49 | -118.17 | 236.35 | 0.132 | 1 | 0.7161 |
| smooth (df = 3) | 4 | 243.56 | 255.56 | -115.78 | 231.56 | 4.788 | 1 | 0.0287 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2017 | 2.3114 | 2.6657 | 0.3542 | 0.2196 | 1.613 | 0.1378 |
| last 20 years | 2006 | 2017 | 2.3114 | 2.6657 | 0.3542 | 0.2196 | 1.613 | 0.1378 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 14.378 | 25.000 | 0.5532 | 0.1209 | 4.577 | 0.0005 |
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
