USGS FS 077-03 Evaluation of OTT PLUVIO Precipitation Gage versus Belfort Universal Precipitation Gage 5-780 -- Supplemental Data, January 15 through July 16, 2002

Table 3. Differences of precipitation measurements between the Belfort Universal Precipitation Gage 5-780, OTT PLUVIO Precipitation Gage, and the NovaLynx Model 260-2510 Standard Rain and Snow Gage, using the paired t-test and Wilcoxon signed-rank test at sites IL11, for 63 comparisons and PA15 for 64 comparisons.

[Abbreviations: --, no data; Belfort, Belfort Universal Precipitation Gage 5-780; OP, OTT PLUVIO precipitation gage; NovaLynx, NovaLynx Model 260-2510 Standard Rain and Snow Gage.]


Gage and site	Mean precipitation (inches)	Median precipitation (inches)	Total precipitation (inches)	Paired t-test			Wilcoxon signed-rank test

				Mean difference	p-value	Mean difference equals zero	p-value	Median difference equals zero
Belfort, IL11	0.28	0.06	17.33	0.037	~0	Reject	~0	Reject
OP, IL11 East	0.33	0.07	20.93	0.305	~0	Reject	0.112	Do not reject
OP, IL11 West	0.33	0.11	20.58	-0.015	0.002	Reject	0.078	Do not reject
NovaLynx, IL11	0.32	0.08	19.66	--	--	--	--	--
Belfort, PA15	0.37	0.19	23.94	-0.011	0.026	Reject	0.003	Reject
OP, PA15	0.38	0.20	24.49	-0.003	0.661	Do not reject	0.203	Do not reject
NovaLynx, PA15	0.38	0.20	24.69	--	--	--	--	--

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