CSEMP assessment of CB52 in sediment at middle (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 118.29 | 120.54 | -56.15 | 112.29 | |||
linear | 2 | 100.51 | 105.08 | -46.25 | 92.51 | 19.785 | 1 | <0.0001 |
smooth (df = 2) | 3 | 102.28 | 110.62 | -46.14 | 92.28 | 0.224 | 1 | 0.6359 |
smooth (df = 3) | 4 | 104.18 | 118.58 | -46.09 | 92.18 | 0.099 | 1 | 0.7527 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2006 | 2018 | -2.5058 | -0.2856 | 2.2201 | 0.3241 | 6.849 | <0.0001 |
last 20 years | 2006 | 2018 | -2.5058 | -0.2856 | 2.2201 | 0.3241 | 6.849 | <0.0001 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.7515 | 0.1200 | -1.8346 | 0.1504 | -12.195 | 1.0000 |
EAC | 0.7515 | 2.7000 | 1.2789 | 0.1504 | 8.501 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Chlorobiphenyls data
Chlorobiphenyls assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for chlorobiphenyls in sediment
- Accessment criteria for chlorobiphenyls in sediment
Media : Sediment (unsieved)
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : CB52
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : CB52
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020