$$ \definecolor{kernel}{RGB}{217,86,16} \definecolor{kde}{RGB}{203,23,206} \definecolor{point}{RGB}{18,110,213} \definecolor{width}{RGB}{45,177,93} \color{kde}\hat{f}_{\color{width}h}\color{black}(x) \color{black} = \frac{1}{n\color{width}h}\color{black}\sum\limits_{i=1}^n \color{kernel}K\color{black}(\frac{x-\color{point}X_i}{\color{width}h}) $$