CSEMP assessment of CB28 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 | 62.78 | 65.03 | -28.39 | 56.78 | |||
linear | 2 | 61.58 | 66.16 | -26.79 | 53.58 | 3.192 | 1 | 0.0740 |
smooth (df = 2) | 3 | 60.76 | 69.09 | -25.38 | 50.76 | 2.827 | 1 | 0.0927 |
smooth (df = 3) | 4 | 57.19 | 71.59 | -22.60 | 45.19 | 5.567 | 1 | 0.0183 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2007 | 2018 | -1.3318 | -0.7005 | 0.6314 | 0.3302 | 1.912 | 0.0882 |
last 20 years | 2007 | 2018 | -1.3318 | -0.7005 | 0.6314 | 0.3302 | 1.912 | 0.0882 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.4964 | 0.2200 | -0.8137 | 0.1806 | -4.505 | 0.9993 |
EAC | 0.4964 | 1.7000 | 1.2311 | 0.1806 | 6.816 | <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 : CB28
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 : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020