ex0524: Vegetarians and Zinc: An Observational Study

In Sleuth2: Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd Ed)"

Description

Previous studies suggest that vegetarians may not receive enough zinc in their diets and the zinc requirement is especially important during pregnancy. Twenty-three women were monitored: twelve vegetarians who were pregnant, six nonvegetarians who were pregnant, and five vegetarians who were not pregnant. Is there any evidence that pregnant vegetarians tend to have lower zinc levels than pregnant nonvegetarians?

Usage

ex0524

Format

A data frame with 23 observations on the following 2 variables.

Zinc

levels of Zinc (mug/g) in the hair of women

Group

a factor with levels "PregNonVeg", "PregVeg" and "NonPregVeg"

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

King, J.C., Stein, T. and Doyle, M. (1981). Effect of Vegetarianism on the Zinc Status of Pregnant Women, American Journal of Clinical Nutrition 34(6): 1049–1055.

Examples

str(ex0524)

Example output

'data.frame':	23 obs. of  2 variables:
 $ Zinc : num  185 189 187 181 150 176 171 174 202 171 ...
 $ Group: Factor w/ 3 levels "PregNonVeg","PregVeg",..: 1 1 1 1 1 1 2 2 2 2 ...

Sleuth2 documentation built on May 2, 2019, 7:01 a.m.