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 | 89.19 | 91.44 | -41.59 | 83.19 | | | |
| linear | 2 | 81.48 | 86.05 | -36.74 | 73.48 | 9.709 | 1 | 0.0018 |
| smooth (df = 2) | 3 | 83.39 | 91.72 | -36.69 | 73.39 | 0.091 | 1 | 0.7629 |
| smooth (df = 3) | 4 | 80.84 | 95.24 | -34.42 | 68.84 | 4.547 | 1 | 0.0330 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2006 | 2018 | 3.599 | 2.743 | -0.8567 | 0.2147 | -3.991 | 0.0032 |
| last 20 years | 2006 | 2018 | 3.599 | 2.743 | -0.8567 | 0.2147 | -3.991 | 0.0032 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 15.53 | 38.00 | 0.8950 | 0.1349 | 6.633 | <0.0001 |
| ERL | 15.53 | 47.00 | 1.1076 | 0.1349 | 8.209 | <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
