Select groups (families)
select_fams(data, prop = 0.75, group, verbose = F)dataframe containing only prop.fam percent the families in data
dataframe as returned by prepare data
proportion of families to be sampled
name of the group variable (character) if not "group", ignored
if TRUE information about sample size is printed out
Mandy Vogel
function selects a given proportion of groups/families from the data
if no grouping variable is given the original data set is returned
function is called inside do_iterations and may not called directly