CSEMP assessment of CB28 in sediment at inner (Firth of Forth)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 118.82 | 120.45 | -56.41 | 112.82 | |||
linear | 2 | 120.27 | 123.47 | -56.13 | 112.27 | 0.550 | 1 | 0.4583 |
smooth (df = 2) | 3 | 122.27 | 127.82 | -56.13 | 112.27 | 0.002 | 1 | 0.9640 |
smooth (df = 3) | 4 | 119.90 | 128.90 | -53.95 | 107.90 | 4.367 | 1 | 0.0366 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 1999 | 2018 | -0.2098 | -0.5689 | -0.3591 | 0.4673 | -0.769 | 0.4570 |
last 20 years | 1999 | 2018 | -0.2098 | -0.5689 | -0.3591 | 0.4673 | -0.769 | 0.4570 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.5662 | 0.2200 | -0.9453 | 0.2600 | -3.635 | 0.9983 |
EAC | 0.5662 | 1.7000 | 1.0995 | 0.2600 | 4.228 | 0.0006 |
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 (< 63 micron fraction)
Station : Firth_of_Forth_(inner)_seSF, inner (Firth of Forth)
Determinand : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Firth_of_Forth_(inner)_seSF, inner (Firth of Forth)
Determinand : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020