[英]Add regression lines from predictive values in ggplot
I've learnt to do this type of plots with r, and add this regression lines predicted from a model. 我学会了用r做这种类型的图,并添加从模型预测的回归线。
## Predict values of the model##
p11=predict(model.coh1, data.frame(COH=coh1, espajpe=1:4))
p12=predict(model.coh1, data.frame(COH=coh2, espaje=1:4))
p11
1 2 3 4
1.996689 2.419994 2.843298 3.266602
p12
1 2 3 4
1.940247 2.414299 2.888351 3.362403
##PLOT##
plot(espapli~espaje, mydata)
lines(1:4,p11, col="red")
lines(1:4,p12, col="green")
Now, I would like to do something similar using ggplot, is that possible? 现在,我想使用ggplot做类似的事情,这可能吗? That is, introducing a regression line for these particular values.
也就是说,为这些特定值引入回归线。
@gennaroTedesco gives an answer using the built in smoothing method. @gennaroTedesco使用内置的平滑方法给出了答案。 I'm not sure that follows the OP.
我不确定遵循OP。 You can do this via
geom_line
您可以通过
geom_line
完成此geom_line
# example data
set.seed(2125)
x <- rnorm(100)
y <- 1 + 2.5 *x + rnorm(100, sd= 0.5)
lm1 <- lm(y~x)
x2 <- rnorm(100)
p1 <- predict(lm1, data.frame(x= x2), interval= "c")
library(ggplot2)
df <- data.frame(x= x2, yhat= p1[,1], lw= p1[,2], up= p1[,3])
# plot just the fitted points
ggplot(df, aes(x= x, y= yhat)) + geom_line()
# also plot the confidence interval
ggplot(df, aes(x= x, y= yhat)) + geom_line() +
geom_line(aes(x= x, y= up, colour= "red")) +
geom_line(aes(x= x, y= lw, colour= "red")) +
theme(legend.position= "none")
# only the last plot is shown
As a general rule regression lines can be added to ggplot
making use of the function geom_smooth
. 作为一般规则,可以添加回归线到
ggplot
利用所述函数的geom_smooth
。 Please see full documentation here . 请在此处查看完整的文档。 If the values to be fitted are the same ones used in the general aesthetic, then
如果要拟合的值与一般美学中使用的值相同,则
p <- ggplot(data, aes(x = x, y = y)
p <- p + geom_smooth(method = 'lm')
does the job. 做这份工作。 Otherwise you need to fully specify the set of data and the model in the
geom_smooth
aesthetics. 否则,您需要在
geom_smooth
美学中完全指定数据集和模型。
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