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→Why is it called "bootstrapping"?
There is also an idiom or a template expression of [https://en.wiktionary.org/wiki/pull_oneself_up_by_one%27s_bootstraps ''pull oneself up by one's bootstraps''], which means to improve one's situation on one's own efforts without any other's help.
The method of bootstrapping is to derive new samples from the original observations with replacement, not from other data source, i.e., pulling samples up from themselves, which implies ''pull oneself up by one's bootstraps''.
