Description Usage Format Details Source References Examples

Data set used in some of OpenMx's examples.

1 | ```
data("twin_NA_dot")
``` |

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

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

Timothy Bates

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

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.
``` |

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