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I'm analyzing the Titanic dataset, and I've been trying to understand the predictive power of the Age feature relative to passenger survival. My intuition is that younger people had a higher chance to survive because they were more resistant to cold water, or that older people survived because they were taken care of by younger ones.

While I can see no difference between the distributions of the two populations, survivors and victims:

violinplot

the permutation importance for my ‎XGBoost model suggests that the Age feature has a certain importance in predicting whether someone survived or not.

permutation importance

Is this difference coming from the fact that:

  1. The predictive power is so small it cannot be observed from a violin plot?
  2. Age alone is not enough to predict survival, but only in combination with other features?
  3. I am misinterpreting the violin plot?

I know it might be impossible to say without having the dataset on hand, so I'm curious what approaches I could try to use to find the reason behind this difference.


Edit:

Summary plot suggests that:

  • Higher age is associated with not surviving
  • Population of younger people (lower age) is smaller than that of older people (there are a few blue spots on the right)

summary-plot

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