I'm using RapidMiner to evaluate correlation between attribute in my dataset. The problem is that a lot of values appear with '?'.
Someone can help me?
Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field. It only takes a minute to sign up.Sign up to join this community
All your data is non-numeric, so there is no straightforward method to compute a correlation value. It appears that the software does compute a correlation value between 2-valued fields (
You will have to work on your data if you want to compute the full correlation matrix:
agefield, you could certainly use a centered numeric value for each category (45 instead of 40-49, 55 instead of 50-59, etc.), or just a rank.
For the rest of the fields, there is no magic trick, unfortunately. You may want to one-hot-encode them, but interpreting the results will be more complicated. There are also ways to test categorical fields independence, but that's a different measure: see this post.