Model Form #1
ln(As) =
- 2.273 + 1.266 ln(SC)
+ 0.127 sin(2π D / 365)
- 0.106 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: | 23 |
|---|---|
| Mean squared error: | 0.0423906921 |
| Multiple R2: | 76 |
| Bias correction (smearing) factor: | 1.0196 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -2.273 | 0.861 | ln(SC) | 1.266 | 0.2 | sin(2π D / 365) | 0.127 | 0.077 | cos(2π D / 365) | -0.106 | 0.105 |
Correlation Matrix
| Intercept | ln(SC) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.9978 | -0.4988 | 0.5458 |
| ln(SC) | -0.9978 | 1 | 0.5182 | -0.5096 |
| sin(2π D / 365) | -0.4988 | 0.5182 | 1 | 0.0783 |
| cos(2π D / 365) | 0.5458 | -0.5096 | 0.0783 | 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.