Find specific patterns in sequences

Question

I\'m using R package TraMineR to make some academic research on sequence analysis.

I want to find a pattern defined as someone being in the target company, then going

Answer 1

The title of the seqpm help page is "Find substring patterns in sequences", and this is what the function actually does. It searches for sequences that contain a given substring (not a subsequence). Seems there is a formulation error in the user's guide.

A solution to find the sequences that contain given subsequences, is to convert the state sequences into event sequences with seqecreate , and then use the seqefsub and seqeapplysub function. I illustrate using the actcal data that ships with TraMineR.

library(TraMineR)
data(actcal)
actcal.seq <- seqdef(actcal[,13:24])

## displaying the first state sequences
head(actcal.seq)

## transforming into event sequences
actcal.seqe <- seqecreate(actcal.seq, tevent = "state", use.labels=FALSE)

## displaying the first event sequences
head(actcal.seqe)

## now searching for the subsequences
subs <- seqefsub(actcal.seqe, strsubseq=c("(A)-(D)","(D)-(B)"))
## and identifying the sequences that contain the subsequences
subs.pres <- seqeapplysub(subs, method="presence")
head(subs.pres)

## we can now, for example, count the sequences that contain (A)-(D)
sum(subs.pres[,1])
## or list the sequences that contain (A)-(D)
rownames(subs.pres)[subs.pres[,1]==1]

Hope this helps.