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Relation between trends in late middle age mortality and trends in old age mortality—is there evidence for mortality selection?
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  • Published on:
    Beyond the edge of statistical analysis

    Dear Editor,

    The mortalities of the 56 sub-cohorts in the study are not randomly chosen from a defined population.[1] However the validity of many statistical analysis methods including regression analysis are based on the condition that samples are random drawn.[2] Therefore the regression model fitted this set of data, in my point of view would be better taken as a description of this set of data rather than pr...

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    Conflict of Interest:
    None declared.
  • Published on:
    Findings from the back of the regression model: re-analysing data from the article

    Dear Editor,

    Mortality data are obtained from table 1a and 1b in the article[1], and SPSS version 11 is used for analysis. There are total 56 “subjects”: 4 (different centralize birth cohort)*7 (different cou...

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    Conflict of Interest:
    None declared.