Long-term effects of sons in bighorn sheep

The file contains longitudinal data collected on female bighorn sheep at Ram Mountain, Alberta, Canada. Explanation of the different columns: id = female identifier year = year of observation reproductive_success = whether or not a female produced a lamb surviving to 1 year of age fecundity = evidence of lactation (1 = yes, 0 = no) lamb_summer_survival = offspring survival to weaning (1 = yes, 0 = no) lamb_winter_survival = offspring survival from weaning to 1 year of age (1 = yes, 0 = no) Lamb_sex = lamb sex (0 = female, 1 = male) previous_reproductive_status = female reproductive status in preceding year (0 = failed, 1 = weaned a female, 2 = weaned a male). Longevity = standardized female longevity in years Age = standardized female age in years Density = standardized population size in June of the year of observation early_Nlamb = standardized number of offspring weaned by a female between 2 and 7 years of age early_sexratio = standardized proportion of sons weaned by a female between 2 and 7 years of age