1個回答
黃石助教
2023-10-31 09:31
該回答已被題主采納
同學您好。如果說是necessarily increasing的話其實是不對的。以離散情況舉例，假設隨機變量X，有如下PMF：P(X = 3) = 0.2，P(X = 4) = 0.4，P(X = 5) = 0，P(X = 6) = 0.4。那么則有CDF：P(X <= 3) = 0.2，P(X <= 4) = 0.6，P(X <= 5) = 0.6，P(X <= 6) = 1。所以，更嚴謹、更全面的說法是non-decreasing；使用increasing會忽略掉一些情境。
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