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

log₁₀(ACT) = - 0.171 + 1.54 log₁₀(TURB) + 0.246 sin(2π D / 365) + 0.194 cos(2π D / 365)

where:

ACT is computed actinomycetes, in colonies per milliliter
TURB is turbidity, YSI EXO, in formazin nephelometric units
D is day of year, in the range of integers 1 through 365

Model Calibration

Basic Data

Number of measurements:	50
Mean squared error:	0.093636
Multiple R²:	0.84
Bias correction (smearing) factor:	1.24

Explanatory Variables

Variable	Value	Standard error
Intercept	-0.171	0.181
log₁₀(TURB)	1.54	0.114
sin(2π D / 365)	0.246	0.0615
cos(2π D / 365)	0.194	0.0814

Correlation Matrix

	Intercept	log₁₀(TURB)	sin(2π D / 365)	cos(2π D / 365)
Intercept	1	-0.969	0.0148	-0.579
log₁₀(TURB)	-0.969	1	0.0231	0.635
sin(2π D / 365)	0.0148	0.0231	1	0.0307
cos(2π D / 365)	-0.579	0.635	0.0307	1

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.