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Chapter 19 - Interpret Model (Four types of impact a feature can have with…
Chapter 19 - Interpret Model
Four types of impact a feature can have with a target
The
overall impact
of a feature without consideration of other features
Creating models with fewer features avoids overfitting
The
overall impact
adjusted for the impact of other features
Feature impact usually more helpful/important than stuff on the insight tab
The
directional impact
of a feature
Insights screen --> Variable effects
Find model that didn't make the 16% cut and go to models tab and re-run with 100% of the dataset
Could lead to different top features
Lines comparable to coefficiengs
Red lines have positive impact
Blue lines have negative impact
The
partial impact
of a feature
Compute model x-ray
Predicted
Actual
Partial dependence
Sort list by
Effect Size
Categories are sorted by those driving good target rates
The power of language
Top non-blender and every blender model take advantage of repeated text features
Find subject matter expert to interpret this data
Word cloud represents word cases with highest coefficients
Analyze large words with vivid colors
Filter stop words
This removes common words assumed to have little value
Set this to "no"
Hotspots
Shows most relevant (up to four) combination of features and their effect on the target
Like word cloud
Analyze large circles and vivid colors
Can filter by "hot" and "cold"
Reason codes
Give individual impact of score on target because of each individual feature
Helps with individual reasons why someone has suggested score
Slower to compute than the model