twin_NA_dot_data: Twin biometric data (Practice cleaning: "." for missing data,...

Description Usage Format Details Source References Examples

Description

Data set used in some of OpenMx's examples.

Usage

1
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, coded as factor

zyg

Integer codes for zygosity and gender combinations

part

Cohort

wt1

Weight in kilograms for twin 1 (this and following have "." embedded as NA...)

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

Details

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

Source

Timothy Bates

References

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

Examples

1
2
3
data(twin_NA_dot)
summary(twin_NA_dot)
# Note that all variables are treated as factors because of the missing data coding.

OpenMx/OpenMx documentation built on March 21, 2020, 4:37 p.m.