CSEMP assessment of chromium 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 | 42.40 | 43.90 | -18.20 | 36.40 | | | |
| linear | 2 | 32.06 | 34.97 | -12.03 | 24.06 | 12.340 | 1 | 0.0004 |
| smooth (df = 2) | 3 | 33.10 | 38.10 | -11.55 | 23.10 | 0.965 | 1 | 0.3260 |
| smooth (df = 3) | 4 | 35.00 | 43.00 | -11.50 | 23.00 | 0.101 | 1 | 0.7511 |
| smooth (df = 4) | 5 | 28.84 | 41.09 | -7.42 | 14.84 | 8.156 | 1 | 0.0043 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2014 | 4.125 | 4.668 | 0.5425 | 0.1230 | 4.409 | 0.0007 |
| last 20 years | 1999 | 2014 | 4.125 | 4.668 | 0.5425 | 0.1230 | 4.409 | 0.0007 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| ERL | 106.43 | 81.00 | -0.27307 | 0.07403 | -3.688 | 0.9986 |
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
