CSEMP assessment of chromium in sediment at Celtic Deep
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | -23.10 | -21.30 | 14.55 | -29.10 | | | |
| linear | 2 | -31.64 | -28.09 | 19.82 | -39.64 | 10.542 | 1 | 0.0012 |
| smooth (df = 2) | 3 | -31.72 | -25.47 | 20.86 | -41.72 | 2.079 | 1 | 0.1494 |
| smooth (df = 3) | 4 | -30.21 | -19.92 | 21.10 | -42.21 | 0.488 | 1 | 0.4848 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2018 | 4.266 | 4.605 | 0.3387 | 0.0834 | 4.060 | 0.0019 |
| last 20 years | 1999 | 2018 | 4.266 | 4.605 | 0.3387 | 0.0834 | 4.060 | 0.0019 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| ERL | 100 | 81 | -0.21072 | 0.05872 | -3.588 | 0.9979 |
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
