Model Form #1
TP =
- 0.181 + 0.000859 TURB
+ 0.0824 log10(Q)
- 0.0182 cos(2π D / 365)
- 0.0413 sin(2π D / 365)
where:
- TP is computed total phosphorus, in milligrams per liter as phosphorus
- TURB is turbidity, YSI model 6136, in formazin nephelometric units
- 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: | 40 |
|---|---|
| Mean squared error: | 0.001936 |
| Multiple R2: | 0.871 |
| Bias correction (smearing) factor: | 1 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -0.181 | 0.044 | TURB | 0.000859 | 6.61E-5 | log10(Q) | 0.0824 | 0.0211 | cos(2π D / 365) | -0.0182 | 0.0182 | sin(2π D / 365) | -0.0413 | 0.0131 |
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.