CSEMP assessment of CB52 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 | 135.17 | 137.17 | -64.58 | 129.17 | |||
linear | 2 | 130.60 | 134.60 | -61.30 | 122.60 | 6.568 | 1 | 0.0104 |
smooth (df = 2) | 3 | 125.03 | 132.17 | -57.51 | 115.03 | 7.574 | 1 | 0.0059 |
smooth (df = 3) | 4 | 127.02 | 139.02 | -57.51 | 115.02 | 0.004 | 1 | 0.9483 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | 0.7081 | -0.9223 | -1.6304 | 0.4963 | -3.285 | 0.0095 |
last 20 years | 2000 | 2017 | 0.7081 | -0.9223 | -1.6304 | 0.4963 | -3.285 | 0.0095 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.3976 | 0.1200 | -1.1979 | 0.4224 | -2.836 | 0.9902 |
EAC | 0.3976 | 2.7000 | 1.9156 | 0.4224 | 4.534 | 0.0007 |
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 : CB52
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 : CB52
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020