Missing Values in Weka --

Question

I'm using adult data from UCI Here, when I converted it to excel file ==> then import it in weka weka didn't recognize the missing values (which tells Missing:0 (0%)) , but the adult data contains missing values with " ?" value...

I checked the value in weka it also contains " ?" so, how can I replace all " ?" to " " !!!

Answer 1

I can say a method.

1. chose filter
2. chose unsupervised-attribute-ReplaceMissingValues
3. Apply

ReplaceMissingValues use 'mean' or 'median' instead of missing values.