CSEMP assessment of arsenic in sediment at Cosheston Point (Milford Haven)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | -83.35 | -81.97 | 44.68 | -89.35 | | | |
| linear | 2 | -91.14 | -88.47 | 49.57 | -99.14 | 9.787 | 1 | 0.0018 |
| smooth (df = 2) | 3 | -94.56 | -90.02 | 52.28 | -104.56 | 5.422 | 1 | 0.0199 |
| smooth (df = 3) | 4 | -93.46 | -86.26 | 52.73 | -105.46 | 0.896 | 1 | 0.3439 |
| smooth (df = 4) | 5 | -98.41 | -87.52 | 56.21 | -112.41 | 6.955 | 1 | 0.0084 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2018 | 2.6704 | 3.1570 | 0.4866 | 0.0995 | 4.889 | 0.0003 |
| last 20 years | 1999 | 2018 | 2.6704 | 3.1570 | 0.4866 | 0.0995 | 4.889 | 0.0003 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 23.501 | 25.000 | 0.06185 | 0.08795 | 0.703 | 0.2471 |
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
