Abstract
In order to estimate the demographic impact of IUD, there is a need for estimating IUD retention rates beyond the period of actual observation. This article describes a mixed exponential function for this purpose. With this function of IUD retention, it is possible to estimate the “life expectancy” and “half-life” of an IUD. Another important concept is the “cut-off date”, introduced in estimating the “life expectancy” because in practice no IUD will be worn by a woman forever.
Life Expectancy, Retention Rate, Actual Observation, Cumulative Density Function, Negative Exponential Function
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© Population Association of America 1972
1972
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