Survey Sample Design for Microfilm Inspection at the National Archives

摘要

The report describes the statistical design of a sample survey to monitor the condition of microfilm in a large collection maintained by the National Archives. The design criterion developed for the survey ensures that the number of rolls of film inspected will be large enough to achieve a pre-chosen probability of detecting a specified amount of damaged film that might exist in the population. Tables and formulas are given to satisfy the design criterion under a range of conditions. Other practical aspects of survey design are discussed including the sampling frame, stratification, sample selection procedure, pilot testing, and the use of replicated sampling.