longDataFrom3d {longitudinalData}

~ Function: longDataFrom3d ~

Description

Extract a single variable-trajectory from an object LongData that contain some joint-trajectories.

Usage

longDataFrom3d(xLongData3d,variable)

Arguments

xLongData3d

[LongData3d]: structure containning some joint-trajectories.

variable

[character]: either the name of one of the variable of xLongData3d, or its number.

Details

Extract a single variable-trajectory from an object LongData3d that contain some join-trajectories.

Value

An object of class LongData.

Author

Christophe Genolini
1. UMR U1027, INSERM, Université Paul Sabatier / Toulouse III / France
2. CeRSME, EA 2931, UFR STAPS, Université de Paris Ouest-Nanterre-La Défense / Nanterre / France

References

[1] C. Genolini and B. Falissard
"KmL: k-means for longitudinal data"
Computational Statistics, vol 25(2), pp 317-328, 2010

[2] C. Genolini and B. Falissard
"KmL: A package to cluster longitudinal data"
Computer Methods and Programs in Biomedicine, 104, pp e112-121, 2011

See Also

LongData

Examples

### Creation of joint-trajectories
mat <- array(c(1,NA,3,2,3,6,1,8,10,1,NA,1,2,NA,3,2,3,2),dim=c(3,3,2))
(ldJoint <- longData3d(mat,varNames=c("Hyp","Som")))

### Extraction of the first variable-trajectory
(ldHyp <- longDataFrom3d(ldJoint,variable="Hyp"))

### Extraction of the second variable-trajectory
(ldSom <- longDataFrom3d(ldJoint,variable="Som"))

### Extraction of the second variable-trajectory, using number
(ldSom <- longDataFrom3d(ldJoint,variable=2))