问题描述
我正在尝试为我的两组平均值绘制一条趋势线，在我的主图中，我将在点上放置误差线以显示 sd，但下面是一个简化版本：
ggplot(sl,aes(x=Stresslevel,y=Final,color=Treatment)) +
geom_point() +
geom_smooth(method = "lm")
在我的输出中，我可以在图例中看到它正在尝试添加它，但它没有显示在图表上： enter image description here
这是数据的图像： enter image description here
编辑：这是我的数据，感谢您的建议>
dput(sl)
structure(list(Stresslevel = structure(c(1L,2L,3L,4L,5L,6L,7L,5L),.Label = c("0","1","2 (30%)","3 (50%)","4 (70%)","5","Recovered"),class = "factor"),WL = c(0,15.5,32.8,52.9,69.8,89.2,13.5,30,50,70),WLsd = c(5,6.5,8.1,8.8,10.6,4.2,9.8,5,5),Final = c(0.0292,0.0276,0.0263,0.0248,0.0208,0.0199,0.0249,0.0274,0.0235,0.0121),Treatment = structure(c(1L,1L,2L),.Label = c("Stressed","Treated"
),Finalsd = c(0.0039,0.0019,0.0026,0.0033,0.002,0.0021,0.0028,0.0049,0.0048,0.0026),Dry = c(0.006,0.008,0.0107,0.0139,0.0138,0.0174,0.0047,0.0116,0.0105),Drysd = c(0.0015,0.0015,0.0017,0.0024,0.0011,0.0022,0.001,0.0016,0.0021),Delta = c(0.0231,0.0196,0.0155,0.0109,0.007,0.0025,0.0201,0.0194,0.012,0.0016),Deltasd = c(0.0034,0.0043,0.0035,0.0013),WC = c(4.07,2.54,1.48,0.81,0.52,0.15,4.44,2.48,1.11,0.16),WCsd = c(1.22,0.59,0.26,0.21,0.2,0.08,1.06,0.56,0.45,0.12),CD = c(1,1.33,1.78,2.31,2.29,2.89,0.78,1.92,1.75),CDsd = c(0.24,0.25,0.28,0.4,0.19,0.37,0.16,0.54,0.35)),class = "data.frame",row.names = c(NA,-10L))
任何帮助将不胜感激。
解决方法
你的 x 变量是一个因子，意味着它是一个分类变量，所以不清楚如何通过它拟合回归线：
str(sl)
'data.frame': 10 obs. of 14 variables:
$ Stresslevel: Factor w/ 7 levels "0","1","2 (30%)",..: 1 2 3 4 5 6 7 3 4 5
$ WL : num 0 15.5 32.8 52.9 69.8 89.2 13.5 30 50 70
我不确定将您的类别转换为数字是否有意义，即压力级别 0 将是 1，压力级别 1 将是 2 等等。并强制一行：
ggplot(sl,aes(x=Stresslevel,y=Final,color=Treatment)) +
geom_point() +
geom_smooth(aes(x=as.numeric(Stresslevel)),method = "lm",se=FALSE)
如果看一下因变量从 0 到 5 压力的进展有意义，我会说连接线可能是有意义的：
ggplot(sl,color=Treatment)) +
geom_point() +
geom_line(aes(x=as.numeric(Stresslevel)),linetype="dashed")
