R 프로그래밍 / R 기초 - 팩터 ???? factor | 범주형 데이터 | 서열팩터(ordered factor) | 레벨(level) | 교차표(crosstabulation)
R 프로그래밍 / R 기초 - 팩터 ???? factor | 범주형 데이터 | 서열팩터(ordered factor) | 레벨(level) | 교차표(crosstabulation)
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