1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
\name{twin_NA_dot}
\alias{twin_NA_dot}
\docType{data}
\title{
Twin biometric data (Practice cleaning: "." for missing data, wrong data types etc.)
}
\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.
\describe{
\item{\code{fam}}{Family ID variable}
\item{\code{age}}{Age of the twin pair. Range: 17 to 88, coded as factor}
\item{\code{zyg}}{Integer codes for zygosity and gender combinations}
\item{\code{part}}{Cohort}
\item{\code{wt1}}{Weight in kilograms for twin 1 (this and following have "." embedded as NA...)}
\item{\code{wt2}}{Weight in kilograms for twin 2}
\item{\code{ht1}}{Height in meters for twin 1}
\item{\code{ht2}}{Height in meters for twin 2}
\item{\code{htwt1}}{Product of ht and wt for twin 1}
\item{\code{htwt2}}{Product of ht and wt for twin 2}
\item{\code{bmi1}}{Body Mass Index for twin 1}
\item{\code{bmi2}}{Body Mass Index for twin 2}
}
}
\details{
Same as \link{myTwinData} but has . as the missing data value instead of NA.
}
\source{
Timothy Bates
}
\references{
The OpenMx User's guide can be found at \url{https://openmx.ssri.psu.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.
}
\keyword{datasets}
|
