conditional probability density

Suppose the probability density of a two-dimensional random variable(X,Y) isf(x,y), (X,Y) about. If for fixed , there is , then is said to be under the condition of The conditional probability density of is recorded as: ANDf_{Y}(y)andf_{Y}(y)>0\frac{f(x,y)}{f_{Y}(y)}Y=andX

f_{X|Y}(x|y)=\frac{f(x,y)}{f_{Y}(y)}

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Origin blog.csdn.net/panghuangang/article/details/135036254