protein {HRW}

Protein intake dietery study

Description

The protein data frame has longitudinal data on protein intake, body mass index and age of subjects in a dietary study.

Usage

data(protein)

Format

This data frame contains the following columns:

idnum

identification number unique to each subject.

proteinBioM

logarithm of intake of protein as measured by the biomarker urinary.

age

age of subject in years.

BMI

body mass index.

proteinRecall

logarithm of intake of protein as measured by a 24-hour recall instrument.

female

indicator that subject is female:
1=subject is female,
0=subject is male.

Source

Kipnis, V., Subar, A.F., Midthune, D., Freedman, L.S., Ballard-Barbash, R., Troiano, R., Bingham, S., Schoeller, D.A., Schatzkin, A. and Carroll, R.J. (2003). The structure of dietary measurement error: results of the OPEN biomarker study. American Journal of Epidemiology, 158, 14-21.

Examples

library(HRW) ; data(protein)
if (require("lattice"))
   print(xyplot(proteinBioM ~ BMI|factor(female),groups = idnum,
                data = protein, type = "b"))