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CH 19 Interpret Model (4 types of impacts of features on target (Overall…
CH 19 Interpret Model
4 types of impacts of features on target
Overall impact of a feature without consideration of impact of other features
examined as logistic regression from target, full green bar = at least 30% of target value
logloss = importance score
predictive value
Overall impact of a feature with consideration of impacts of other features
Randomly shuffle values in one feature then evaluate performance
Directional impact of a feature
Whether presence of a value increases predictive ability
red bars indicate feature values that make positive cases more likely blue bars indicate feature values that make negative cases more likely
Partial impact of a feature
frequency vs. features
effects= coefficients
power of language
word cloud= words with highest coefficients
intensity of color = higher coefficient
stop word = assumed to have little value
hotspot screen shows most relevant combo of features and effects on target
Reason Codes evaluates individual level
left and right thresholds allow to change probability
left (blue) = 0-.22 right (red) = .585-1.0
Insights screen is key