Md. Rafiqul Islam  , 
    Study the Differentials, Patterns, Trends and Mathematical Modeling of Expectation of Life (Ex) of Bangladesh,
    Pakistan Journal of Social Sciences,
    Volume 3,Issue 8,
    2005,
    Pages 1060-1064,
    ISSN 1683-8831,
    pjssci.2005.1060.1064,
    (https://makhillpublications.co/view-article.php?doi=pjssci.2005.1060.1064)
    Abstract: The purpose of the present study is to study the differentials, patterns and trends of expectation of life (ex) of Bangladesh during 1961-1991. For this, the expectation of life (ex) of Bangladesh in the census years 1961, 1974, 1981 and 1991 have been used in this study. A few mathematical models have been fitted to ex and f(x)=x+ex only for male of Bangladesh in 1961 and it is found that they follow polynomial models. The Cross-Validity Prediction Power (CVPP) and F-test are also applied to these models to check the validity and significance of the models.
    Keywords: Expectation of life (ex);mathematical modeling;coefficient of determination (R2 );cross-validity prediction power (CVPP);F-test