[Traminer-users] clustering event sequence data

[Hugo Varet]

Hello Mat,

a few months ago, I wanted to perform clustering of event sequences
and Matthias
Studer told me how to do this with the TraMineRextras package. I think you
can find his message in the archives of the mailing list (he sent it on
march 16th 2012).

To extract association rules from event sequences and to get the
corresponding hazard ratios, you have to use the seqerulesdisc function
available in the same package.

Hope this helps, best regards,

Hugo


2012/7/9 Weldon, Mat <m.weldon at lancaster.ac.uk>

>  Hello,****
>
> ** **
>
> I’m doing a project with a set of criminal histories (ie. Lists of
> age-stamped offences). Here is an example: oftype is the type of crime, and
> sid is the subject ID:****
>
>         sid        oftype   age****
>
> 5556.1 5556           B&E    18****
>
> 5556.2 5556 motor vehicle    18****
>
> 5556.3 5556 motor vehicle    18****
>
> 5556.4 5556           B&E    22****
>
> 5556.5 5556       alcohol    24****
>
> 5556.6 5556 miscellaneous    29****
>
> ** **
>
> Since these are events, I’m using the event methods in TraMineR to analyse
> them. I’ve created a seqe object, and run a frequent sub-sequence analysis.
> Here is the top 10:****
>
>            Subsequence   Support Count****
>
> 1            (assault) 0.6261261   417****
>
> 2  (child molestation) 0.6246246   416****
>
> 3               (rape) 0.5000000   333****
>
> 4              (theft) 0.4429429   295****
>
> 5                (B&E) 0.4159159   277****
>
> 6      (noncontact SO) 0.3963964   264****
>
> 7       (public order) 0.3858859   257****
>
> 8            (alcohol) 0.3183183   212****
>
> 9  (assault)-(assault) 0.3018018   201****
>
> 10    (assault)-(rape) 0.2882883   192****
>
> ** **
>
> Computed on 666 event sequences****
>
>   Constraint Value****
>
>  countMethod  COBJ****
>
> ** **
>
> I’d like to compute clusters of sequences, either using agnes or pam
> algorithms, and then run a discriminating sequence analysis on the clusters
> (as demonstrated by Studer et al. 2010). However, I’m a bit stuck and I
> haven’t been able to find any help in the documentation. I have a few
> questions:****
>
> ** **
>
> **1.       **Is there a function for computing dissimilarity measures,
> like seqdist, that works with event sequences? Something that I can feed
> into a clustering algorithm? I don’t know how Studer et al. did it because
> no code was provided.****
>
> **2.       **Is there a way to constrain frequent subsequences to be
> maximal, in the sense that if “(assault)-(assault)” is frequent then
> “(assault)” will not be listed, for example?****
>
> **3.       **Is there a way to calculate association rules for sequences
> using a hazard ratio measure similar to that described in Muller et al.
> (2010)?****
>
> ** **
>
> Many thanks in advance. Best wishes,****
>
> ** **
>
> Mat****
>
> ** **
>
> Mat Weldon****
>
> Department of Mathematics and Statistics****
>
> Room B18, Fylde College ****
>
> Lancaster University****
>
> Lancaster, LA1 4YF****
>
> Tel: 07929 310475****
>
> Email: m.weldon at lancaster.ac.uk****
>
> ** **
>
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