OpenMx (version 2.6.7)

twin_NA_dot: Twin data on weight and height

Description

Data set used in some of OpenMx's examples.

Usage

data("twin_NA_dot")

Format

A data frame with 3808 observations on the following variables.

fam

Family ID variable

age

Age of the twin pair. Range: 17 to 88.

zyg

Integer codes for zygosity and gender combinations

part

wt1

Weight in kilograms for twin 1

wt2

Weight in kilograms for twin 2

ht1

Height in meters for twin 1

ht2

Height in meters for twin 2

htwt1

Product of ht and wt for twin 1

htwt2

Product of ht and wt for twin 2

bmi1

Body Mass Index for twin 1

bmi2

Body Mass Index for twin 2

Source

Timothy Bates

Details

Same as myTwinData but has . as the missing data value instead of NA.

References

The OpenMx User's guide can be found at http://openmx.psyc.virginia.edu/documentation.

Examples

data(twin_NA_dot)
summary(twin_NA_dot)
# Note that all variables are treated as factors because of the missing data coding.