seq2qha | R Documentation |

Recodes sequence data into the shape used for qualitative harmonic analysis.

```
seq2qha(seqdata, periods)
```

`seqdata` |
a sequence object (see |

`periods` |
numeric vector of the first positions of the periods used for recoding |

A data frame with one column by combination of period and state (i.e. number of columns = number of periods * number of states in the alphabet).

Nicolas Robette

Robette N., Thibault N. (2008). Comparing qualitative harmonic analysis and optimal matching. An exploratory study of occupational trajectories, *Population-E*, Vol. 64(3), 533-556.
Deville J-C. (1982). Analyse de données chronologiques qualitatives: comment analyser des calendriers ?, *Annales de l’INSEE*, 45, 45-104.
Deville J-C., Saporta G. (1980). Analyse harmonique qualitative, in *Data analysis and informatics*, E.Diday (ed.), Amsterdam, North Holland Publishing, 375-389.

```
data(trajact)
seqact <- seqdef(trajact)
qha <- seq2qha(seqact, periods=c(1,3,7,12,24))
head(qha)
```

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