Model Form #1
log10(TP) =
- 1.4584 - 0.0811 log10(Q)
+ 0.4574 log10(TURB)
- 0.0443 sin(2π D / 365)
- 0.02 cos(2π D / 365)
- 0.0038 sin(4π D / 365)
- 0.0529 cos(4π D / 365)
where:
- TP is computed total phosphorus, in milligrams per liter as phosphorus
- Q is computed discharge, in cubic feet per second
- 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: | 44 |
|---|---|
| Mean squared error: | 0.00736164 |
| Multiple R2: | 0.7314 |
| Bias correction (smearing) factor: | 1.0172 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -1.4584 | 0.05 | log10(Q) | -0.0811 | 0.0298 | log10(TURB) | 0.4574 | 0.0563 | sin(2π D / 365) | -0.0443 | 0.0168 | cos(2π D / 365) | -0.02 | 0.0206 | sin(4π D / 365) | -0.0038 | 0.0175 | cos(4π D / 365) | -0.0529 | 0.0176 |
Correlation Matrix
| Intercept | log10(Q) | log10(TURB) | sin(2π D / 365) | cos(2π D / 365) | sin(4π D / 365) | cos(4π D / 365) | |
|---|---|---|---|---|---|---|---|
| Intercept | 1 | -0.0607 | -0.5696 | -0.1556 | 0.2165 | -0.0813 | -0.031 |
| log10(Q) | -0.0607 | 1 | -0.7713 | 0.0769 | -0.4853 | 0.2306 | 0.2231 |
| log10(TURB) | -0.5696 | -0.7713 | 1 | 0.0346 | 0.2244 | -0.1423 | -0.1484 |
| sin(2π D / 365) | -0.1556 | 0.0769 | 0.0346 | 1 | -0.1018 | -0.0213 | 0.066 |
| cos(2π D / 365) | 0.2165 | -0.4853 | 0.2244 | -0.1018 | 1 | -0.1299 | -0.1356 |
| sin(4π D / 365) | -0.0813 | 0.2306 | -0.1423 | -0.0213 | -0.1299 | 1 | 0.062 |
| cos(4π D / 365) | -0.031 | 0.2231 | -0.1484 | 0.066 | -0.1356 | 0.062 | 1 |