[character]: define the aglomerative method used
to compute the mean. Three methods are
curently available: "all", "sample" and "hierarchical". See
meanFrechet and [1] for details.
shuffle
[logical]: if the agglomerationMethod is "all" or "sample", this variable is use
to decide if the trajectories will be agglomerate in a random order (shuffle=TRUE) or not.
If not, the lexical order based on the individual identifiant is used.
sampleSize
[integer]: Define the number of trajectories
that will be use to compute the meanFrechet
when the aggregationMethod is "sample".
methodHclust
[character]: define the distance between
two clusters used by the hierarchical clustering when the aggregationMethod
is "hierarchical". The methods
available are the one for hclust
maxIter
[numeric]: the maximum number of iteration allowed.
providing 
.