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 | 1.41 | 3.66 | 2.29 | -4.59 | | | |
| linear | 2 | 3.35 | 7.92 | 2.32 | -4.65 | 0.059 | 1 | 0.8076 |
| smooth (df = 2) | 3 | -0.70 | 7.63 | 5.35 | -10.70 | 6.055 | 1 | 0.0139 |
| smooth (df = 3) | 4 | 1.28 | 15.68 | 5.36 | -10.72 | 0.022 | 1 | 0.8829 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2016 | 4.518 | 4.550 | 0.03149 | 0.12924 | 0.244 | 0.8129 |
| last 20 years | 2006 | 2016 | 4.518 | 4.550 | 0.03149 | 0.12924 | 0.244 | 0.8129 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| ERL | 94.62 | 81.00 | -0.15538 | 0.07349 | -2.114 | 0.9682 |
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
