I have a categorical variable with 4 levels ('8 c', '6 c','NAN','Others') and I want to convert it to numerical form. an Obvious way is to simply remove the 'c' part from the first two categories and replace NAN with 0. However, I was wondering about the 'Others' level?
What could be the best way to transform this level? Please note that the variable represents the number of cylinders for a given car.