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Feature creation ideas for propensity models?

Usually you want a feature to be important regardless of the model. For customers there is usually 4 types of data you can use 1) operational data - usually from a database. Contains the history of ...
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do feature selection and model selection must share the same ratio between development set and test set?

Feature selection has nothing to do with a model. It is just finding a candidate list of related (or even unrelated) features that might be in a model, so it this put there is no rule that says it ...
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