Hi, I looked at the documentation for the package, and it would appear that all members have to be in all the lists, for the matrix to be complete. However, I had a set of lists, not all of whose members are common. For example: List 1: a, b, d, k, c List 2: b, d, e, c List 3: a, c, k, f I think this is a likely scenario, especially in microarray data where a particular gene may not be present in all the individual samples (corruption/noise etc.). Is there a way to handle these partial lists within the package? thanks! [[alternative HTML version deleted]]