what feature is missing what is the contingency table in feature engineering what feature to make a table contingency which feature will the classifier need to get this right? how to see which features are necessary what feature does it need in feature engineering what feature would the classifier need to get this right? if it never appears in the development set, it is what feature would the classifier need to get this right? what is meant by contingency what is meant by contingency table what is meant by contingency table in feature engineer what feature would the classifier need to get this right why contingency table is not useful if it never appears what features are confusing the classifier what features are confusing the classifier what is meant by contingency table how does a feature engineer make a contingency table why is it useful to use a contingency table how to get the accuracy of a feature in a feature engineer if it never appears in the development set, it is not useful. why is it important?