Exercise

# Imputing Missing Data

Missing data happens. If we make the assumption that our data is missing completely at random, we are making the assumption that what data we do have, is a good representation of the population. If we have a few values we could remove them or we could use the mean or median as a replacement. In this exercise, we will look at `'PDOM'`

: Days on Market at Current Price.

Instructions

**100 XP**

- Get a count of the missing values in the column
`'PDOM'`

using`where()`

,`isNull()`

and`count()`

. - Calculate the mean value of
`'PDOM'`

using the aggregate function`mean()`

. - Use
`fillna()`

with the value set to the`'PDOM'`

mean value and only apply it to the column`'PDOM'`

using the`subset`

parameter.