seqstart: Aligning sequence data on a new start time.

In TraMineRextras: TraMineR Extension

Aligning sequence data on a new start time.

Description

Changing the position alignment of a set of sequences.

Usage

seqstart(seqdata, data.start, new.start, tmin = NULL, tmax = NULL, missing = NA)

Arguments

seqdata	a data frame or matrix containing sequence data.
data.start	Integer. The actual starting date of the sequences. In case of sequence-dependent start dates, should be a vector of length equal to the number of rows of seqdata.
new.start	Integer. The new starting date. In case of sequence-dependent start dates, should be a vector of length equal to the number of rows of seqdata.
tmin	Integer. Start position on new position axis. If NULL, it is guessed from the data.
tmax	Integer. End position on new position axis. If NULL, it is guessed from the data.
missing	Character. Code used to fill missing data in the new time axis.

Value

A matrix.

Note

Warning: This function needs further testing.

Author(s)

Matthias Studer

Examples

#An example data set
paneldata <- matrix(c("A" ,"A" , "B" , "B" , "B",
"A" , "A" , "B" , "B" , "B",
"A" , "A",  "B" , "B" , "B" ,
"A"  ,"A" , "A" , "B"  ,"B" ,
"A"  ,"A" , "A" , "A" , "B"), byrow=TRUE, ncol=5)
colnames(paneldata) <- 2000:2004

print(paneldata)

## Assuming data are aligned on calendar years, starting in 2000
## Change from calendar date to age alignment
startyear <- 2000
birthyear <- 1995:1999
agedata <- seqstart(paneldata, data.start=startyear, new.start=birthyear)
colnames(agedata) <- 1:ncol(agedata)
print(agedata)

## Retaining only ages between 3 and 7 (4th and 8th year after birthyear).
seqstart(paneldata, data.start=startyear, new.start=birthyear, tmin=4, tmax=8, missing="*")

## Changing back from age to calendar time alignment
ageatstart <- startyear - birthyear
seqstart(agedata, data.start=1,  new.start=ageatstart)
## Same but dropping right columns filled with NA's
seqstart(agedata, data.start=1,  new.start=ageatstart, tmax=5)

TraMineRextras documentation built on Aug. 19, 2024, 3:02 p.m.