CSEMP assessment of CB180 in sediment at Holy Loch (Clyde)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 24.66 | 26.16 | -9.33 | 18.66 | | | |
| linear | 2 | 26.60 | 29.51 | -9.30 | 18.60 | 0.064 | 1 | 0.8001 |
| smooth (df = 2) | 3 | 27.87 | 32.87 | -8.94 | 17.87 | 0.725 | 1 | 0.3945 |
| smooth (df = 3) | 4 | 29.87 | 37.87 | -8.94 | 17.87 | 0.002 | 1 | 0.9684 |
| smooth (df = 4) | 5 | 30.10 | 42.35 | -8.05 | 16.10 | 1.769 | 1 | 0.1835 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2000 | 2018 | 1.2543 | 1.3776 | 0.1233 | 0.4864 | 0.254 | 0.8038 |
| last 20 years | 2000 | 2018 | 1.2543 | 1.3776 | 0.1233 | 0.4864 | 0.254 | 0.8038 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 3.965 | 0.100 | -3.680 | 0.311 | -11.842 | 1.0000 |
| EAC | 3.965 | 12.000 | 1.107 | 0.311 | 3.563 | 0.0017 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Chlorobiphenyls data
Chlorobiphenyls assessment
Related pages
