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Organization

Office of the Associate Director for Water

Office of the Associate Director for Water
http://water.usgs.gov/

Location
John W Powell
12201 Sunrise Valley Drive
Reston , VA 20192-0002
USA
Parent Organization: Office of the Director for USGS
This is the Supporting Material for Chapter 06: Paired Difference Tests of the Center. This chapter addresses using matched-pair tests. As opposed to the tests of chapter 5, we now consider data having a logical pairing of observations within each group.
Categories: Data
This is the Supporting Material for Chapter 05: Testing Differences Between Two Independent Groups. This chapter discusses the nonparametric, permutation, and parametric tests for whether two independent groups differ in central location.
Categories: Data
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This dataset contains all of the supporting materials to accompany Helsel, D.R., Hirsch, R.M., Ryberg, K.R., Archfield, S.A., and Gilroy, E.J., 2020, Statistical methods in water resources: U.S. Geological Survey Techniques and Methods, book 4, chapter A3, 454 p., https://doi.org/10.3133/tm4a3. [Supersedes USGS Techniques of Water-Resources Investigations, book 4, chapter A3, version 1.1.]. Supplemental material (SM) for each chapter are available to re-create all examples and figures, and to solve the exercises at the end of each chapter, with relevant datasets provided in an electronic format readable by R. The SM provide (1) datasets as .Rdata files for immediate input into R, (2) datasets as .csv files for input...
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This dataset includes discrete water quality data and sensor data from 2009-2017 for Beaver Creek above Victoria Creek and West Twin Creek in Alaska.
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Surface-based 2D electrical resistivity tomography (ERT) surveys were used to investigate the distribution of permafrost at wetland sites on the alluvial plain north of the Tanana River, 20 km southwest of Fairbanks, Alaska, in June and September 2014. The sites contained habitat types characteristic of interior Alaska, including thermokarst bog, forested permafrost plateau, and a rich fen. These habitats range from treed to open and vary in groundcover vegetation and peat thickness. Individual surveys used a cable with 56 electrodes at 2-m spacing. At a fen site, ERT surveys were performed across a mixed spruce forest area across a vegetation gradient into an open fen area. At a bog site,surveys were performed...
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