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학습내용 출처 : https://unlimitedpower.tistory.com/entry/IR-%EB%A7%88%EC%9D%B4%ED%81%AC%EB%A1%9C-%ED%8F%89%EA%B7%A0Micro-average-%EB%A7%A4%ED%81%AC%EB%A1%9C-%ED%8F%89%EA%B7%A0Macro-average-%EC%9D%B4%EB%9E%80-%EB%AC%B4%EC%97%87%EC%9D%B8%EA%B0%80