Column- predictor column. this works only when type is "predict". Columns to be used as predictors.
type- The default is "mean". Set how you want to impute NA. This can be numeric value to replace NA or types listed below.
val(Optional) - This works when type is "value" or "predict". When it's "value", a value to replace NA or a column to replace NA at the same position. If it's "predict", a column to use for prediction of NA. More than one column can be used by indicating <column(s)>.