CSEMP assessment of arsenic 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 | 40.73 | 42.01 | -17.36 | 34.73 | | | |
| linear | 2 | 42.14 | 44.60 | -17.07 | 34.14 | 0.583 | 1 | 0.4453 |
| smooth (df = 2) | 3 | 41.26 | 45.43 | -15.63 | 31.26 | 2.883 | 1 | 0.0895 |
| smooth (df = 3) | 4 | 42.22 | 48.77 | -15.11 | 30.22 | 1.039 | 1 | 0.3081 |
| smooth (df = 4) | 5 | 43.35 | 53.15 | -14.68 | 29.35 | 0.870 | 1 | 0.3510 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2000 | 2017 | 2.7491 | 2.8762 | 0.12711 | 0.16545 | 0.768 | 0.4542 |
| last 20 years | 2000 | 2017 | 2.7491 | 2.8762 | 0.12711 | 0.16545 | 0.768 | 0.4542 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 17.747 | 25.000 | 0.3426 | 0.0983 | 3.486 | 0.0017 |
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
