Model Form #1
SO4 =
- 324.158 + 0.426 SC
+ 56.52 log10(Q)
- 7.248 cos(4π D / 365)
- 5.918 sin(4π D / 365)
where:
- SO4 is computed sulfate, in milligrams per liter as sulfate
- 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: | 75 |
|---|---|
| Mean squared error: | 318.9796 |
| Multiple R2: | 0.941 |
| Bias correction (smearing) factor: | 1 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -324.158 | 17.865 | SC | 0.426 | 5.103 | log10(Q) | 56.52 | 0.0145 | cos(4π D / 365) | -7.248 | 2.908 | sin(4π D / 365) | -5.918 | 3.527 |
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.