How can I replace the '?' values in Weka.
I have a dataset. There are nominal values in a column which also have some values '?'. I tried to replace missing values with replacemissingvalues filter in Weka. This filter replaced those cells which did not have any values like blank cells but it could not replace '?'. How could I replace ? in Weka?
Screenshot of values with ? symbol.
Thank you.
CodePudding user response：
The 
Use the filter Replace with missing value to replace '?' with blank cells. use this filter before using filter ReplaceMissingValues filter. However, from what I have seen you can randomly replace with missing value. Am not sure if specific values like '?', ' ?','? ' can be replaced with missing value(blank cell)
Best method is to opt for the first one, this you tube link provides 3 different ways to deal with missing value and shows the way how you can access Replace values with...