CSEMP assessment of nickel in sediment at Forth Estuary
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 38.26 | 39.46 | -16.13 | 32.26 | | | |
| linear | 2 | 40.23 | 42.52 | -16.12 | 32.23 | 0.027 | 1 | 0.8698 |
| smooth (df = 2) | 3 | 41.52 | 45.36 | -15.76 | 31.52 | 0.713 | 1 | 0.3984 |
| smooth (df = 3) | 4 | 43.50 | 49.50 | -15.75 | 31.50 | 0.014 | 1 | 0.9072 |
| smooth (df = 4) | 5 | 42.96 | 51.87 | -14.48 | 28.96 | 2.547 | 1 | 0.1105 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2000 | 2017 | 3.473 | 3.492 | 0.01911 | 0.11658 | 0.164 | 0.8719 |
| last 20 years | 2000 | 2017 | 3.473 | 3.492 | 0.01911 | 0.11658 | 0.164 | 0.8719 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 32.84 | 36.00 | 0.09190 | 0.06638 | 1.384 | 0.0926 |
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
