CSEMP assessment of CB28 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 | 109.95 | 111.75 | -51.97 | 103.95 | |||
linear | 2 | 107.92 | 111.47 | -49.96 | 99.92 | 4.031 | 1 | 0.0447 |
smooth (df = 2) | 3 | 91.25 | 97.50 | -40.63 | 81.25 | 18.665 | 1 | <0.0001 |
smooth (df = 3) | 4 | 90.72 | 101.01 | -39.36 | 78.72 | 2.528 | 1 | 0.1118 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2018 | -1.9578 | -0.8017 | 1.1560 | 0.2483 | 4.657 | 0.0009 |
last 20 years | 2000 | 2018 | -1.9578 | -0.8017 | 1.1560 | 0.2483 | 4.657 | 0.0009 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.4485 | 0.2200 | -0.7124 | 0.1528 | -4.663 | 0.9996 |
EAC | 0.4485 | 1.7000 | 1.3324 | 0.1528 | 8.722 | <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 : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : CB28
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020