Using Survival Analysis to Predict Sample Retention Rates
نویسندگان
چکیده
1. Introduction and Motivation The International Price Program (IPP) publishes monthly price indexes which measure the average change over time in prices of internationally traded products and services. IPP's sampling methodology supports its published merchandise price indexes by attempting to maintain a minimum number of items over the two year life cycle 1 of each published stratum. Retention rates-which measure the proportion of sampled items in a stratum which are still active (non-discontinued) after a certain amount of time past the sample fielding date-are used to set the minimum stratum item allocation.
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