Developed in partnership with the Lower Platte River Corridor Alliance and the Nebraska Environmental Trust
Model Form #1
log10(ATRR) =
- 2.7532 + 0.5358 log10(TURB)
+ 0.3597 sin(2π D / 365)
- 1.2798 cos(2π D / 365)
where:
- ATRR is computed atrazine, in micrograms per liter
- TURB is turbidity, YSI model 6136, in formazin nephelometric units
- D is day of year, in the range of integers 1 through 365
Model Calibration
Basic Data
| Number of measurements: | 46 |
|---|---|
| Mean squared error: | 0.2401 |
| Multiple R2: | 0.52 |
| Bias correction (smearing) factor: | 1.89 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -2.7532 | 0.4097 | log10(TURB) | 0.5358 | 0.2165 | sin(2π D / 365) | 0.3597 | 0.1133 | cos(2π D / 365) | -1.2798 | 0.3031 |
Correlation Matrix
| Intercept | log10(TURB) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.8645 | 0.1422 | 0.0513 |
| log10(TURB) | -0.8645 | 1 | -0.2106 | 0.4315 |
| sin(2π D / 365) | 0.1422 | -0.2106 | 1 | -0.1662 |
| cos(2π D / 365) | 0.0513 | 0.4315 | -0.1662 | 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.