Hi, I am using the clusters function in the evd package in order to determine storm events from a wave time series. So far I have the code working as I want it for wave height on its own but I would now like to include the period as well. The input data is in the form of: H t H t H t so every height measurement has a corresponding period. The storms are defined when the wave height exceeds a certain value and what I am looking to do is to retain the corresponding periods relating to the wave heights in the cluster. This would essentially result in a cluster with 2 variables. Does any one have any ideas? Thanks in advance, Doug -- View this message in context: http://r.789695.n4.nabble.com/Storm-Clustering-using-clusters-in-evd-tp3229951p3229951.html Sent from the R help mailing list archive at Nabble.com.