Model Form #1
ln(As) =
9.662 + 0.039 SC
- 2.426 ln(SC)
+ 0.142 sin(2π D / 365)
+ 0.172 cos(2π D / 365)
where:
- As is computed arsenic, in micrograms per liter as arsenic
- 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: | 0.02007889 |
| Multiple R2: | 93 |
| Bias correction (smearing) factor: | 1.013 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | 9.662 | 4.445 | SC | 0.039 | 0.016 | ln(SC) | -2.426 | 1.338 | sin(2π D / 365) | 0.142 | 0.087 | cos(2π D / 365) | 0.172 | 0.14 |
Correlation Matrix
| Intercept | SC | ln(SC) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|---|
| Intercept | 1 | 0.9789 | -0.9981 | 0.5073 | -0.689 |
| SC | 0.9789 | 1 | -0.9895 | 0.6263 | -0.79 |
| ln(SC) | -0.9981 | -0.9895 | 1 | -0.5441 | 0.724 |
| sin(2π D / 365) | 0.5073 | 0.6263 | -0.5441 | 1 | -0.5803 |
| cos(2π D / 365) | -0.689 | -0.79 | 0.724 | -0.5803 | 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.