Estimating the Probability of Elevated Nitrate Concentrations in Ground Water in Washington State

Scientific Investigations Report 2008–5025

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5025

Table 3. Statistical results from models that estimate the probability of nitrate concentrations exceeding 2 milligrams per liter in ground water in Washington.

[Abbreviations: <, less than.]

Statistical results	Model
Statistical results	With hydrogeomorphic region	Without hydrogeomorphic region
Log-likelihood ratio	2,452	2,378
p-value	<.0001	<.0001
McFadden’s rho-squared	.193	.187
Percentage of correct responses	81.33	81.33

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