Model Form #1
SO4R =
- 239.31 + 0.353 SC
+ 36.406 log10(Q)
- 11.011 cos(2π D / 365)
- 6.178 sin(2π D / 365)
where:
- SO4R is computed sulfate, in milligrams per liter
- SC is specific conductance at 25 degrees Celsius, in microsiemens per centimeter
- Q is computed discharge, stage-discharge rating curve, in cubic feet per second
- D is day of year, in the range of integers 1 through 365
Model Calibration
Basic Data
| Number of measurements: | 65 |
|---|---|
| Mean squared error: | 215.2089 |
| Multiple R2: | 0.894 |
| Bias correction (smearing) factor: | 1 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -239.31 | 14.667 | SC | 0.353 | 0.0155 | log10(Q) | 36.406 | 5.079 | cos(2π D / 365) | -11.011 | 3.342 | sin(2π D / 365) | -6.178 | 3.122 |
Correlation Matrix
A correlation matrix is not available for this model. Therefore, the prediction interval was calculated by assuming that there is no correlation between the explanatory variables.
Reference
- Galloway, J., 2014, Continuous Water-Quality Monitoring and Regression Analysis to Estimate Constituent Concentrations and Loads in the Red River of the North at Fargo and Grand Forks, North Dakota, 2003–12: U.S. Geological Survey Scientific Investigations Report 2014–5064, 37 p.