CSEMP assessment of CB52 in sediment at Forth Estuary
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 119.67 | 121.47 | -56.84 | 113.67 | |||
linear | 2 | 112.46 | 116.01 | -52.23 | 104.46 | 9.216 | 1 | 0.0024 |
smooth (df = 2) | 3 | 113.30 | 119.55 | -51.65 | 103.30 | 1.156 | 1 | 0.2822 |
smooth (df = 3) | 4 | 112.62 | 122.91 | -50.31 | 100.62 | 2.677 | 1 | 0.1018 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2018 | -2.0154 | -0.3987 | 1.6167 | 0.4274 | 3.783 | 0.0030 |
last 20 years | 2000 | 2018 | -2.0154 | -0.3987 | 1.6167 | 0.4274 | 3.783 | 0.0030 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.6712 | 0.1200 | -1.7216 | 0.1749 | -9.842 | 1.0000 |
EAC | 0.6712 | 2.7000 | 1.3919 | 0.1749 | 7.957 | <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 : Forth_Estuary_seSF (Forth Estuary)
Determinand : CB52
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : CB52
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020