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Hi Simon,<br>
<br>
I answer in English as other users may be interested by your
question. There are several ways to truncate sequences to a varying
length.<br>
<br>
Suppose we are working with the mvad data set and we would like to
truncate sequence to a random varying length<br>
<br>
## Creating the mvad sequence<br>
library(TraMineR)<br>
data(mvad)<br>
<br>
mvad.alphabet <- c("employment", "FE", "HE", "joblessness",
"school",<br>
"training")<br>
mvad.labels <- c("employment", "further education", "higher
education",<br>
"joblessness", "school", "training")<br>
mvad.scodes <- c("EM", "FE", "HE", "JL", "SC", "TR")<br>
mvad.seq <- seqdef(mvad, 17:86, alphabet = mvad.alphabet, states
= mvad.scodes,<br>
labels = mvad.labels, xtstep = 6)<br>
<br>
<br>
<br>
## Here we generate a random integer to cut the sequences<br>
## The results is a vector of length 712 with integer values ranging
from 10 to 69<br>
## This should be the length you would like to use to truncate your
sequences<br>
randomlength <- as.integer(runif(nrow(mvad))*60)+10<br>
head(randomlength)<br>
<br>
## On way is to use a "position" matrix, which store, for each cell
the current position in the sequence<br>
positionindex <- matrix(1:70, nrow=nrow(mvad), ncol=70,
byrow=TRUE)<br>
<br>
head(positionindex)<br>
<br>
## Using this position matrix, we can affect the "void" attribute
(i.e. end of sequence) to each position <br>
## that are greater than the truncating date<br>
mvad.seq[positionindex > randomlength] <- attr(mvad.seq,
"void")<br>
<br>
## Checking the results<br>
all.equal(as.numeric(seqlength(mvad.seq)), randomlength)<br>
<br>
## Plotting result<br>
seqiplot(mvad.seq)<br>
<br>
## Another way would be to use a loop <br>
## This may take much longer to compute<br>
## Personally, I prefer the previous solution<br>
<br>
mvad.seq <- seqdef(mvad, 17:86, alphabet = mvad.alphabet, states
= mvad.scodes,<br>
labels = mvad.labels, xtstep = 6)<br>
<br>
## For each sequence<br>
for(i in 1:length(randomlength)){<br>
## for the given position until the end assign the "void"
element<br>
## We should add one to randomlength to cut after the
randomlength<br>
mvad.seq[i, (randomlength[i]+1):ncol(mvad.seq)] <-
attr(mvad.seq, "void")<br>
}<br>
<br>
seqiplot(mvad.seq)<br>
## Checking the results<br>
all.equal(as.numeric(seqlength(mvad.seq)), randomlength)<br>
<br>
<br>
Hope this helps.<br>
<br>
Matthias Studer<br>
<br>
<br>
<br>
<br>
<br>
<br>
Le 19.05.2011 16:17, Simon PAYE a écrit :
<blockquote
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<p class="MsoNormal">Bonjour chers collègues,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Je fais irruption dans votre liste pour une
question qui me
travaille depuis quelque temps et qui potentiellement peut
intéresser beaucoup
d’analystes de séquences avec des durées variées (notamment les
carrières).</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Je dispose d’une base d’une centaine de
carrières d’universitaires
codées en STS d’une longueur de 5 à 47 années.</p>
<p class="MsoNormal">Pour mes analyses, j’ai besoin de les aligner
à droite (‘external
time reference’ ou ‘calendar time axis’), ou de les aligner à
gauche (‘internal
time reference’ ou ‘process time axis’). Jusqu’ici, pas de
problème, car je
peux passer d’un modèle à l’autre en utilisant les options
‘left’ et ‘right’ de
seqdef.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tout se complique lorsque je souhaite
tronquer les séquences
selon une date historique variable selon les individus. </p>
<p class="MsoNormal">Dans mon cas, c’est l’année d’obtention de la
tenure (emploi
permanent), que j’ai renseignée dans une variable appelée
‘year.tenure’. Si je
veux, par exemple, analyser les séquences menant à la tenure en
les alignant
toutes à droite selon l’année d’obtention de la tenure, comment
dois-je
procéder ?</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Je n’ai pas trouvé de solution dans le
‘user’s guide’, ni
dans les autres documents disponibles sur le site de TraMineR.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Merci pour votre réponse et pour tout ce que
vous avez fait
jusque là,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon</p>
<o:p> </o:p><br>
-- <br>
Simon Paye<br>
Doctorant en sociologie<br>
Centre de Sociologie des Organisations - Sciences Po Paris<br>
<br>
Tel: 0148741267<br>
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