Kansas Real-Time Water Quality

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

Model Form #2

PGeo =	e ^{- 34.118 - 3.279 sin(2π D / 365) + 0.393 cos(2π D / 365) + 3.995 PH}
	1 + e^{- 34.118 - 3.279 sin(2π D / 365) + 0.393 cos(2π D / 365) + 3.995 PH}

where:

PGeo is computed probability of geosmin >= 5 ng/L
D is day of year, in the range of integers 1 through 365
PH is pH, in standard units

Model Archive Summary

The model archive summary for computed probability of geosmin can be viewed in pdf form here.

Model Calibration

Basic Data

Number of measurements:	48
Bias correction (smearing) factor:	1

Explanatory Variables

Variable	Value	Standard error
Intercept	-34.118	17.635
sin(2π D / 365)	-3.279	0.943
cos(2π D / 365)	0.393	0.513
PH	3.995	2.072

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

Graham, J.L., Foster, G.M., Williams, T.J., Kramer, A.R., 2017, Occurrence of cyanobacteria, microcystin, and taste-and-odor compounds in Cheney Reservoir, Kansas, 2001–16: U.S. Geological Survey Scientific Investigations Report 2017–5016, 57 p.

Notes

Logistic Probability Geosmin