Person

Dennis R Helsel

17 items:

Chapter 06: Paired Difference Tests of the Center -- Resources 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
Statistical Methods in Water Resources - Supporting Materials 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... Tags: Not applicable., USGS Science Data Catalog (SDC), Water Resources, statistical analysis
Chapter 05: Testing Differences Between Two Independent Groups -- Resources 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
Chapter 12: Trend Analysis -- Resources This is the Supporting Material for Chapter 12: Trend Analysis. In this chapter, various common types of trend tests are classified, and their strengths and weaknesses are compared. Categories: Data
Chapter 02: Graphical Data Analysis -- Resources This is the Supporting Material for Chapter 02: Graphical Data Analysis. This chapter discusses graphical methods for analysis of a single dataset, methods for comparison of two or more groups of data, and plots that are appropriate for multivariate data. Categories: Data

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