what shape of the curve is k mean? what is k-mean longitudinal why should a longitudinal data set be grouped together what shape of the curve is used to cluster countries how to group the shapes of the growth curve what is k-means longitudinal data when is kml needed to group countries? how to cluster a country what is clustering and how to do longitudinal clustering which shape for a time series cluster why group countries for longitudinal clustering how does k-means clustering work what shape of the curve is used for clustering what shape should a longitudinal curve be what shape of curve do you group a country based off what is longitudinal clustering why do some countries cluster what shape of the curves is a longitudinal clustering curve which of the following is a characteristic of a longitudinal curve? why do we cluster based on shape