CSEMP assessment of nickel 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 | 38.26 | 39.46 | -16.13 | 32.26 | |||
linear | 2 | 40.23 | 42.52 | -16.12 | 32.23 | 0.027 | 1 | 0.8698 |
smooth (df = 2) | 3 | 41.52 | 45.36 | -15.76 | 31.52 | 0.713 | 1 | 0.3984 |
smooth (df = 3) | 4 | 43.50 | 49.50 | -15.75 | 31.50 | 0.014 | 1 | 0.9072 |
smooth (df = 4) | 5 | 42.96 | 51.87 | -14.48 | 28.96 | 2.547 | 1 | 0.1105 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | 3.473 | 3.492 | 0.01911 | 0.11658 | 0.164 | 0.8719 |
last 20 years | 2000 | 2017 | 3.473 | 3.492 | 0.01911 | 0.11658 | 0.164 | 0.8719 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 32.84 | 36.00 | 0.09190 | 0.06638 | 1.384 | 0.0926 |
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 : Forth_Estuary_seSF (Forth Estuary)
Determinand : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020