Statistical Stationarity of Sediment Interbed Thicknesses in a Basalt Aquifer, Idaho National Laboratory, Eastern Snake River Plain, Idaho

Scientific Investigations Report 2008–5167

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5167

Table 9. Results of nonparametric tests of similarity of sediment thickness medians, variances, and frequency distribution shapes, Idaho National Laboratory, Idaho.

[Selected data from Anderson and Liszewski (1997) and data gathered in this study, with various degrees of artificial censoring. Abbreviations: M-W, Mann-Whitney test of similarity of medians; L, Levene’s test of similarity of variances; K-S, Kolmogorov-Smirnov test of similarity of distribution shape; p-value, probability value; vs., versus; >, greater than]

Sedimentary interbed thicknesses of composite units 1–7			Test	p-value	Number of measurements from samples
1		2	Test	p-value	1	2
			M-W	0.000	74	97
Anderson and Liszewski (1997)	vs.	This data set	L	0.861	74	97
			K-S	0.000	74	97
			M-W	0.014	74	73
Anderson and Liszewski (1997)	vs.	This data set (> 1 foot)	L	0.687	74	73
			K-S	0.000	74	73
			M-W	0.991	74	56
Anderson and Liszewski (1997)	vs.	This data set (> 2 feet)	L	0.617	74	56
			K-S	0.386	74	56
			M-W	0.050	74	46
Anderson and Liszewski (1997)	vs.	This data set (> 3 feet)	L	0.603	74	46
			K-S	0.103	74	46

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