How the variable importance is measured during model building?

@ankit81195 wrote:

Whenever I have built a model using different algorithms like the random forest I usually calculate the variable importance.So I do not overfit the model.

variable importance - It tells about the predictor which contribute most in predicting the dependent variable.

There is function which we can use to calculate the importance of the variable like in random forest importance()

I want what is the logic for this method .

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