Kansas Real-Time Water Quality

Kansas Real-Time Water Quality

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USGS station:	Go to NWISWeb
Constituent:
Time period:
Model Form:

Model Form #2

PCyano =	e ^{0.724 - 1.254 sin(2π D / 365) - 3.725 cos(2π D / 365) - 0.0928 TURB}
	1 + e^{0.724 - 1.254 sin(2π D / 365) - 3.725 cos(2π D / 365) - 0.0928 TURB}

where:

PCyano is computed probability of cyanobacteria > 10,000 cells/mL
D is day of year, in the range of integers 1 through 365
TURB is turbidity, YSI EXO, in formazin nephelometric units

Model Calibration

Basic Data

Number of measurements:	57
Bias correction (smearing) factor:	1

Explanatory Variables

Variable	Value	Standard error
Intercept	0.724	1.393
sin(2π D / 365)	-1.254	0.74
cos(2π D / 365)	-3.725	1.247
TURB	-0.0928	0.0488

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

Foster, G.M., Graham, J.L., 2016, Logistic and linear regression model documentation for statistical relations between continuous real-time and discrete water-quality constituents in the Kansas River, Kansas, July 2012 through June 2015: U.S. Geological Survey Open-File Report 2016-1040, 27 p.

Notes

Logistic Probability Cyanobacteria