薛真 · 2020年02月07日
问题如下：
How are quantile functions related to the CDF? When X is a continuous random variable, when does this relationship not hold?
选项：
解释：
The quantile function is the inverse of the CDF function.
That is, if returns the CDF value of X, then is the quantile function.
The CDF function is not invertible if there are regions where there is no probability. This corresponds to a jump in the CDF, as shown in the figures that follow.
解析中as shown in the figures that follow，无图啊.
NO.PZ2020010302000006问题如下How are quantile functions relateto the C? When X is a continuous ranm variable, when es this relationship not holThe quantile function is the inverse of the C function.This, if u=FX(x)u = F_X(x)u=FX(x) returns the C value of X, then q=FX−1(u)q = F_X^{-1}(u)q=FX−1(u) is the quantile function.The C function is not invertible if there are regions where there is no probability. This correspon to a jump in the C.老师好，这是您回答别的同学的问题给出的p和c的图，其中c不是纵轴是概率吗，那当概率是0是，为什么不是我画的红线呢？而是介于y轴0.2至0.4之间呢？在0.2-0.4之间不仍然是有概率吗？
这道题什么意思 讲义里没讲啊
