根据乘法概率法则，将某一年龄段的留存率与前一年龄段的生存率相乘可得该年龄段的生存率。
According to probability principle of multiplication, the survival rate was the product of retention rate at certain period and survival rate at the previous period.
但是在此次衰退中，失业率的上升幅度远比欧坤法则的众多公式推导出的幅度大的多。
But it has risen more during this recession than most formulations of Okun’s Law would suggest.
表面上，大数法则可以解释dell的低增长率。
On the surface, Dell seems the victim of the law of large numbers.
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