CSEMP assessment of arsenic in sediment at Cosheston Point (Milford Haven)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | -96.13 | -94.63 | 51.06 | -102.13 | | | |
| linear | 2 | -98.06 | -95.15 | 53.03 | -106.06 | 3.936 | 1 | 0.0473 |
| smooth (df = 2) | 3 | -96.08 | -91.08 | 53.04 | -106.08 | 0.015 | 1 | 0.9034 |
| smooth (df = 3) | 4 | -98.05 | -90.05 | 55.03 | -110.05 | 3.978 | 1 | 0.0461 |
| smooth (df = 4) | 5 | -96.14 | -83.89 | 55.07 | -110.14 | 0.090 | 1 | 0.7641 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 1999 | 2014 | 2.6225 | 2.7916 | 0.16918 | 0.07938 | 2.131 | 0.0527 |
| last 20 years | 1999 | 2014 | 2.6225 | 2.7916 | 0.16918 | 0.07938 | 2.131 | 0.0527 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 16.308 | 25.000 | 0.4272 | 0.0472 | 9.054 | <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
