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"Different performance from Backward Elimination when not using the operator"
I used the Backward Elimination operator to optimize my AUC for logistic regression by eliminating some attributes. However, when I stop using the Backward Elimination operator and eliminate the same attributes myself using the Selected Attribute operator (based on Backward Elimination operator's results) the resultant AUC/Performance is not the same (it lower). This is the same for many optimization operators (Optimize Parameter (Grid), Forward Selection).
How do these optimization operators work and how are they different from doing it manually (without optimization operator) ?
My data has 2030 instances with 33 features and 1 binary dependent variable.