TraMineR (version 1.8-9)

seqtransn: Number of transitions in a sequence

Description

Computes the number of transitions in each sequence of a sequence object.

Usage

seqtransn(seqdata, with.missing=FALSE, norm=FALSE, pweight=FALSE)

Arguments

seqdata

a state sequence object as defined by the seqdef function.

with.missing

logical. if set as TRUE, missing states (gaps in sequences) are considered as an additional state and included in the DSS sequence. See seqdss.

norm

logical. If set as TRUE, the number of transitions is divided by its theoretical maximum, the length of the sequence minus 1. When length of the sequence is 1, normalized value is set to 0 as in the non-normalized case.

pweight

logical. EXPERIMENTAL! If set as TRUE, when counting transitions each transition does not account for 1 but for its probability (transition rate) as observed in the data.

Value

• a state sequence object containing the number of transitions of each sequence in the object given as argument.

encoding

latin1

Details

A transition in a sequence is a state change between time/position $t$ and $t+1$. For example, the sequence "A-A-A-A-B-B-A-D-D-D" contains 3 transitions. The maximum number of transitions a sequence can contain is $\ell-1$ where $\ell$ is the length of the sequence. The number of transitions is obtained by subtracting 1 to the length of the the Distinct Successive State (DSS) sequence.

References

Gabadinho, A., G. Ritschard, N. S. M�ller and M. Studer (2011). Analyzing and Visualizing State Sequences in R with TraMineR. Journal of Statistical Software 40(4), 1-37.

See Also

seqdss.

Examples

## Creating a sequence object from columns 13 to 24
## in the 'actcal' example data set
data(actcal)
actcal.seq <- seqdef(actcal,13:24)

## Computing the number of transitions
actcal.trans <- seqtransn(actcal.seq)

## Displaying the DSS for the first 10 sequences
actcal.trans[1:10]

## Example with with.missing argument
data(ex1)
ex1.seq <- seqdef(ex1, 1:13)

seqtransn(ex1.seq)
seqtransn(ex1.seq, with.missing=TRUE)