Hi, I have a dataset like this: Species length (cm) A 12.4 B 45 A 34.6 C 73 C 24.5 D 4.5 . . I'm trying to obtain a barplot with the class length in x (fixed classes, 5 cm) and the number of species in y, but using just a barplot is not the case (I think). So, maybe the best way is to first obtain a frequency table and then to plot the graph, but I managed only to obtain a frequency table with 5 cm of class length but the frequency are the numbers of individuals by class and this is not what I need. Do you know how I can do? Thank you in advance. Paola [[alternative HTML version deleted]]