calcium {EngrExpt}

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)