CSEMP assessment of CB28 in sediment at outer (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 101.16 | 102.66 | -47.58 | 95.16 | |||
linear | 2 | 101.65 | 104.56 | -46.82 | 93.65 | 1.510 | 1 | 0.2192 |
smooth (df = 2) | 3 | 96.95 | 101.95 | -43.48 | 86.95 | 6.694 | 1 | 0.0097 |
smooth (df = 3) | 4 | 97.93 | 105.93 | -42.96 | 85.93 | 1.028 | 1 | 0.3107 |
smooth (df = 4) | 5 | 92.93 | 105.18 | -39.47 | 78.93 | 6.995 | 1 | 0.0082 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | -0.4460 | -0.9449 | -0.4989 | 0.3880 | -1.286 | 0.2228 |
last 20 years | 2000 | 2017 | -0.4460 | -0.9449 | -0.4989 | 0.3880 | -1.286 | 0.2228 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.3887 | 0.2200 | -0.5692 | 0.3223 | -1.766 | 0.9486 |
EAC | 0.3887 | 1.7000 | 1.4756 | 0.3223 | 4.579 | 0.0003 |
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_(outer)_seSF, outer (Firth of Clyde)
Determinand : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(outer)_seSF, outer (Firth of Clyde)
Determinand : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020