Developed in partnership with the Lower Platte River Corridor Alliance and the Nebraska Environmental Trust
Model Form #1
log10(ATRR) =
- 2.3704 + 0.5236 log10(TURB)
+ 0.3869 sin(2π D / 365)
- 1.2295 cos(2π D / 365)
where:
- ATRR is computed atrazine, in micrograms per liter
- TURB is turbidity, in formazin nephelometric units
- D is day of year, in the range of integers 1 through 365
Model Calibration
Basic Data
| Number of measurements: | 45 |
|---|---|
| Mean squared error: | 0.1089 |
| Multiple R2: | 0.68 |
| Bias correction (smearing) factor: | 1.29 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -2.3704 | 0.3067 | log10(TURB) | 0.5236 | 0.1522 | sin(2π D / 365) | 0.3869 | 0.0806 | cos(2π D / 365) | -1.2295 | 0.1915 |
Correlation Matrix
| Intercept | log10(TURB) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.885 | 0.0305 | 0.1044 |
| log10(TURB) | -0.885 | 1 | -0.0653 | 0.346 |
| sin(2π D / 365) | 0.0305 | -0.0653 | 1 | -0.0729 |
| cos(2π D / 365) | 0.1044 | 0.346 | -0.0729 | 1 |
Reference
- Schaepe, Nathaniel J.; Soenksen, Philip J.; Rus, David L., 2014, Relations of water-quality constituent concentrations to surrogate measurements in the lower Platte River corridor, Nebraska, 2007 through 2011: U.S. Geological Survey Open-File Report 2014–1149, 16 p.