Dear List I hope you can help me: I?ve got a dataframe (df) within which I am looking for Peak Over Threshold values as well as the length of the events. An event starts when walevel equals 5.8 and it should end when walevel equals the lower threshold value (5.35). I tried ?clusters (?)? from ?evd package?, and varied r (see example) but it did not work for all events (again see example). walevel <- c(5.75, 5.75, 5.75, 5.76, 5.80, 5.82, 5.85, 5.86, 5.91, 5.91, 5.88, 5.92, 5.99, 6.02, 6.00, 6.08, 6.11, 6.10, 6.10, 6.11, 6.14, 6.12, 6.15, 6.17, 6.15, 6.08, 6.01, 5.95, 5.89, 5.83, 5.77, 5.72, 5.70, 5.65, 5.59, 5.51, 5.43, 5.33, 5.30, 5.25, 5.22, 5.21, 5.19, 5.19, 5.19, 5.13, 5.15, 5.07, 5.04, 5.02, 4.99, 5.05, 5.07, 5.12, 5.17, 5.22, 5.32, 5.29, 5.33, 5.33, 5.36, 5.37, 5.42, 5.43, 5.48, 5.55, 5.57, 5.66, 5.68, 5.72, 5.77, 5.79, 5.81, 5.80, 5.80, 5.77, 5.72, 5.70, 5.66, 5.62, 5.62, 5.61, 5.59, 5.57, 5.51, 5.47, 5.41, 5.39, 5.40, 5.40, 5.42, 5.45, 5.47, 5.50, 5.50, 5.49, 5.43, 5.39, 5.33, 5.26) day <- c(1:100) df <- data.frame(day,walevel) library(evd) clusters(df$walevel, u = 5.80, r = 1, ulow = 5.35, cmax = T, plot = T) clusters(df$walevel, u = 5.80, r = 50, ulow = 5.35, cmax = T, plot = T) What have I done wrong? Tonja