Evaluate the probability density function.
Parameters: | endog_predict: array_like, optional :
exog_predict: array_like, optional :
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Returns: | pdf: array_like :
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Notes
The formula for the conditional probability density is:
f(y|x)=\frac{f(x,y)}{f(x)}
with
f(x)=\prod_{s=1}^{q}h_{s}^{-1}k \left(\frac{x_{is}-x_{js}}{h_{s}}\right)
where k is the appropriate kernel for each variable.