EngrExpt: calcium – R documentation

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calcium

Calcium levels before and after taking vitamin

Description

The serum calcium levels in 11 test subjects before taking a multi-vitamin containing calcium and three hours after taking the vitamin.

Format

A data frame with 11 observations on the following 2 variables.

hrs0: serum calcium level (mg/dl) at time zero
hrs3: serum calcium level (mg/dl) three hours after taking the multi-vitamin containing calcium

Details

This was a small pilot study to test the effectiveness of the multi-vitamin with respect to calcium absorption.

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

str(calcium)
show(pl1 <-
     xyplot(hrs3 ~ hrs0, calcium, type = c("g","p"), aspect = "iso",
            xlab = "Calcium level (mg/dl) before taking multi-vitamin",
            ylab =
            "Calcium level (mg/dl) 3 hours after taking multi-vitamin"))
tmd(pl1)

EngrExpt

Data sets from "Introductory Statistics for Engineering Experimentation"

v0.1-8

GPL (>= 2)

Authors

R port by Douglas Bates <bates@stat.wisc.edu> and Karen A.F. Copeland <karen@boulderstats.com>

Initial release

2009-08-21