USGS Scientific Investigations Report 2013–5103  - Application of the SPARROW Model to Assess Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest

Scientific Investigations Report 2013–5103 

Application of the SPARROW Model to Assess Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest

Table 8. Comparison of fit statistics for the National Hydrography Dataset and RF1 SPARROW models developed for the United States Pacific Northwest. 

[Abbreviations: NHD, National Hydrography Dataset; RF1, River Reach File 1; R², coefficient of determination; RMSE, root mean squared error] 

Fit Statistic	Total nitrogen		Total phosphorus
Fit Statistic	NHD model	RF1 model	NHD model	RF1 model
R² of yield	0.908	0.759	0.810	0.712
RMSE	0.398	0.640	0.549	0.693

First posted July 17, 2013

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