CSEMP assessment of arsenic 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 | -29.00 | -26.43 | 17.50 | -35.00 | |||
linear | 2 | -28.53 | -23.20 | 18.27 | -36.53 | 1.526 | 1 | 0.2167 |
smooth (df = 2) | 3 | -27.46 | -17.46 | 18.73 | -37.46 | 0.930 | 1 | 0.3350 |
smooth (df = 3) | 4 | -25.54 | -7.54 | 18.77 | -37.54 | 0.078 | 1 | 0.7803 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2006 | 2016 | 2.230 | 2.338 | 0.10802 | 0.08647 | 1.249 | 0.2469 |
last 20 years | 2006 | 2016 | 2.230 | 2.338 | 0.10802 | 0.08647 | 1.249 | 0.2469 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 10.361 | 25.000 | 0.8808 | 0.0411 | 21.424 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in sediment
- Accessment criteria for metals in sediment
Media : Sediment (< 63 micron fraction)
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020