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                ## 基本散點圖展示 ### 應用場景 可以展示數據分布特征,比如說:我們可以看看數據樣本中患者年齡分布情況,也可以分組看看不同組別患者年齡分布趨勢。 ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074255.png) ### 利用ggplot2創建density plot ```R load("./cli_test.Rdata") # rt_cli數據形式如上圖 library(ggplot2) ggplot(rt_cli, aes(age)) + geom_density(color= "#E69F00", alpha=0.4) # scale_color_manual設置線條顏色 ggplot(rt_cli, aes(age, colour = stage)) + geom_density() + scale_color_manual(values=c("#999999", "#E69F00", "#56B4E9", "#FF6666")) # alpha 改變填充顏色深度 ggplot(rt_cli, aes(age, colour = stage, fill = stage)) + geom_density(alpha=0.4) + scale_fill_manual(values=c("#999999", "#E69F00", "#56B4E9", "#FF6666")) ### 計算每個stage age的均值 library(plyr) age_mm <- ddply(rt_cli, "stage", summarise, grp.mean=mean(age)) ### 利用geom_vline添加均值值所在的位置 ggplot(rt_cli, aes(age, colour = stage, fill = stage)) + geom_density(alpha=0.4) + geom_vline(data = age_mm, aes(xintercept = grp.mean, color = stage), linetype="dashed") + scale_fill_manual(values=c("#999999", "#E69F00", "#56B4E9", "#FF6666")) + theme_classic() ``` ![scatter plot](http://kancloud.nordata.cn/2018-12-30-74256.png)![scatter plot](http://kancloud.nordata.cn/2018-12-30-074256.png) ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074257.png)![scatter plot](http://kancloud.nordata.cn/2018-12-30-074258.png)
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