[R] Select random observation from a group

Hello, I have a dataset with family data. For an analysis, I need to select one subject per family at random. Here is an example of what my data look like: FamilyID IndividualID DadIDMomID Sex 1101103 104 1 1

[R] L'abbe plot

I cannot seem to get a L'abbe plot to work on R. I do not understand what the X coordinates, or alternatively an object of class metabin, is supposed to mean. What is a class of metabin? Institute of Behavioral Genetics University of Colorado, Boulder whitney.mel...@colorado.edu _