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 | 54.60 | 55.99 | -24.30 | 48.60 | | | |
| linear | 2 | 38.90 | 41.57 | -15.45 | 30.90 | 17.702 | 1 | <0.0001 |
| smooth (df = 2) | 3 | 32.71 | 37.25 | -11.35 | 22.71 | 8.193 | 1 | 0.0042 |
| smooth (df = 3) | 4 | 33.33 | 40.53 | -10.66 | 21.33 | 1.377 | 1 | 0.2406 |
| smooth (df = 4) | 5 | 35.19 | 46.08 | -10.59 | 21.19 | 0.140 | 1 | 0.7080 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2018 | 4.225 | 5.335 | 1.1104 | 0.1387 | 8.006 | <0.0001 |
| last 20 years | 1999 | 2018 | 4.225 | 5.335 | 1.1104 | 0.1387 | 8.006 | <0.0001 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| ERL | 207.51 | 81.00 | -0.9407 | 0.1241 | -7.580 | 1.0000 |
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
