ex0623: Diet Wars

In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

Description

These data are simulated to match the summary and conclusions of a real study of overweight employees who were randomly assigned to three diet groups: a low-fat diet, a low-carb diet (similar to the Atkins diet), and a Mediterranean diet. The study ran for two years, with 272 employees completing the entire protocol. Is there evidence of differences in average weight loss among these diets? If so, which diets appear to be better than which others?

Usage

ex0623

Format

A data frame with 272 observations on the following 3 variables.

Subject

subject identification number

Group

a factor with levels "Low-Carbohydrate", "Low-Fat", and "Meditrranean"

WtLoss24

weight at the end of the 24 month study minus initial weight, in kg

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

See Also

ex1420, ex1921, ex1922

Examples

str(ex0623)

Example output

'data.frame':	272 obs. of  3 variables:
 $ Subject : int  1 2 3 4 5 6 7 8 9 10 ...
 $ Group   : Factor w/ 3 levels "Low-Carbohydrate",..: 2 2 2 2 2 2 2 2 2 2 ...
 $ WtLoss24: num  2.2 -4.8 2.9 4.4 9.6 6.3 2.3 2.6 5.9 -2.2 ...

Sleuth3 documentation built on May 2, 2019, 6:41 a.m.