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Chapter 19: Interpret Model (Directional Impact (whether the presence of a…
Chapter 19: Interpret Model
Feature Impacts on Target
1.
) Overall
Impact
without consideration of the impact of other features
overall impact of a feature adjusted for the impact of other features
directional
partial
Model X-Ray
constructs a list of features ranked by their influence on the target denoted by the size of the green line under each feature name in the left pane
also shows partial dependence
Overall Impact: features on the target without consideration of other features
treats each feature as a standalone effect on the target
shows in the feature importance greenbar section
allows for more focus on these specific items
Where to find? In the "Feature Impact" Section
scales the most important feature to 100% and the other features follow suit
via randomly scrambling all of the features to detect importance
also has the ability to create a new feature list based upon most important features
Directional Impact
whether the presence of a value helps the model by assisting it in predicting
found in "Variable Effects"
provides coefficients
then switch to the 'models' screen
has feature values that make the model positive
then examine the LogLoss score
Hotspots
from "insights", visualization via 'RuleFit Classifer'
this is a red flag
shows most relevant combinations of features on the target
Reason Codes
examined along with an analysis of how these values determined that patient's probability of readmission
supplements decisions