Reproductive failure of red squirrels and associated measurements

Data collected in the field from 1989 to 2012 on reproductive failure in red squirrels and associated variables. Columns are: LitID- litter ID # in analysis, Grid - study area in which squirrel was living, YR - Year of reproductive attempt, LN - reproductive attempt number of that year for the female (all are the first litter), BDATE - estimated parturition date of litter (based on live trap monitoring of females), FoodSup - whether squirrels were provided food supplementation (1) or not (0), MOMID - unique ear tag numbers of female squirrels, litsize - number of pups in litter, PCI - previous years spruce cone index (log transformed), weas - annual average number of weasel tracks/100km counted in area, marten - annual average number of marten tracks/100km counted in area, pYRSurv - proportion of that years cohort of juveniles that survived the winter to the following year, cold - coldest 4-day average temperature experienced during the first 14 days of lactation (Environment Canada’s National Climate Data and Information Archive (www.climate.weatheroffice.gc.ca)), mBY - birth year of the female, pred - annual average number of mustelid (marten and weasel) tracks/100km counted in area, MAge - maternal age.