CSEMP assessment of chromium 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 | 16.96 | 18.96 | -5.48 | 10.96 | | | |
| linear | 2 | 18.55 | 22.55 | -5.28 | 10.55 | 0.407 | 1 | 0.5235 |
| smooth (df = 2) | 3 | 18.44 | 25.59 | -4.22 | 8.44 | 2.110 | 1 | 0.1463 |
| smooth (df = 3) | 4 | 18.00 | 30.00 | -3.00 | 6.00 | 2.444 | 1 | 0.1180 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2017 | 4.506 | 4.584 | 0.07750 | 0.12109 | 0.640 | 0.5366 |
| last 20 years | 2006 | 2017 | 4.506 | 4.584 | 0.07750 | 0.12109 | 0.640 | 0.5366 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| ERL | 97.87 | 81.00 | -0.18917 | 0.06826 | -2.771 | 0.9901 |
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
