在估计遗传及表型参数时，建立系统分组模型剔除非遗传效应的父系半同胞法优于简单的父系半同胞法；
It is more accurate to estimate genetic and phenotypic parameters from a hierachical classification model excluding non-genetic deviattion than from a simple paternal half-sib correlation.
第三部分报业集团战略诊断模型由PEST分析、五力分析和系统分析三部分组成。
The strategic diagnostic model includes three components: the PEST analysis, Five-Forces model analysis and system analysis.
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