Abstract
Life data statistical methods are proposed for the analysis of dairy cattle production data representing the time from one event to another. The Kaplan-Meier estimator of survival is described and its applications to dairy cattle data are exemplified with data sets of replacement times, time from calving to first case of mastitis and time from calving to first insemination. All data sets include censored data from cows for which the event had not been observed at the end of lactation or data collection period. A method for modifying replacement times to a standard calving interval is presented. A simple non-parametric test of homogeneity in two samples is described.
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