Model Form #1
ln(Sb) =
- 0.867 + 0.021 SC
+ 0.152 sin(2π D / 365)
+ 0.41 cos(2π D / 365)
where:
- Sb is computed antimony, in micrograms per liter
- SC is specific conductance at 25 degrees Celsius, in microsiemens per centimeter
- D is day of year, in the range of integers 1 through 365
Model Calibration
Basic Data
| Number of measurements: | 20 |
|---|---|
| Mean squared error: | 0.08128201 |
| Multiple R2: | 90 |
| Bias correction (smearing) factor: | 1.032 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -0.867 | 0.548 | SC | 0.021 | 0.005 | sin(2π D / 365) | 0.152 | 0.147 | cos(2π D / 365) | 0.41 | 0.195 |
Correlation Matrix
| Intercept | SC | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.9883 | -0.6953 | 0.7945 |
| SC | -0.9883 | 1 | 0.724 | -0.7373 |
| sin(2π D / 365) | -0.6953 | 0.724 | 1 | -0.3221 |
| cos(2π D / 365) | 0.7945 | -0.7373 | -0.3221 | 1 |
Reference
- Etheridge, A.B., 2015, Occurrence and transport of selected constituents in streams near the Stibnite mining area, central Idaho, 2012–14: U.S. Geological Survey Scientific Investigations Report 2015–5166, 47 p.