Data Analysis with Two Groups

10 Pages Posted: 21 Oct 2008

See all articles by Phillip E. Pfeifer

Phillip E. Pfeifer

University of Virginia - Darden School of Business

Abstract

This note illustrates several data analysis techniques that can be used to compare two groups of interval data.

Excerpt

UVA-QA-0386

Rev. Sept. 30, 2013

DATA ANALYSIS WITH TWO GROUPS

This note illustrates several data-analysis techniques that can be used to compare two groups of interval data. We illustrate these techniques using data for the weights of anorexic patients before and after treatment. The data are supplied in Exhibit 1. The underlying question is whether the treatment helps patients gain weight.

Displaying the Data

A well-drawn picture or graph of the data is often a good place to begin. This note illustrates two ways to graph interval data: the histogram and the box-whisker plot.

. . .

Keywords: data analysis, statistics

Suggested Citation

Pfeifer, Phillip E., Data Analysis with Two Groups. Darden Case No. UVA-QA-0386. Available at SSRN: https://ssrn.com/abstract=1283401

Phillip E. Pfeifer (Contact Author)

University of Virginia - Darden School of Business ( email )

P.O. Box 6550
Charlottesville, VA 22906-6550
United States
434-924-4803 (Phone)

HOME PAGE: http://www.darden.virginia.edu/faculty/Pfeifer.htm

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