R language ggplot2 visualization: draw a grouped histogram and set the Y axis as a proportional value instead of a frequency value

R language ggplot2 visualization: draw a grouped histogram and set the Y axis as a proportional value instead of a frequency value

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R language ggplot2 visualization: draw a grouped histogram and set the Y axis as a proportional value instead of a frequency value

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Origin blog.csdn.net/zhongkeyuanchongqing/article/details/121736170