CSEMP assessment of lead in sediment at Bann Estuary
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 84.44 | 87.01 | -39.22 | 78.44 | | | |
| linear | 2 | 79.46 | 84.79 | -35.73 | 71.46 | 6.979 | 1 | 0.0082 |
| smooth (df = 2) | 3 | 81.20 | 91.20 | -35.60 | 71.20 | 0.262 | 1 | 0.6089 |
| smooth (df = 3) | 4 | 78.74 | 96.74 | -33.37 | 66.74 | 4.458 | 1 | 0.0347 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2017 | 3.606 | 2.801 | -0.8047 | 0.2510 | -3.206 | 0.0125 |
| last 20 years | 2006 | 2017 | 3.606 | 2.801 | -0.8047 | 0.2510 | -3.206 | 0.0125 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 16.47 | 38.00 | 0.8363 | 0.1604 | 5.215 | 0.0004 |
| ERL | 16.47 | 47.00 | 1.0489 | 0.1604 | 6.540 | <0.0001 |
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
