[英]How to visulaize linear model prediction in ggplot along with confidence interval?
假設我正在使用my_df擬合線性模型。 得到估計后,我想看看model1可以很好地預測另一個數據集的n個案例。 我不確定以下是否是可視化此方法的正確方法,以及如何根據model1估算值添加置信區間鍵。
#Make up a dataframe and perform a linear model
res <- c(2,3.1,4.5,5.1,6.5,7.1,8.5,9.11,10.1,11.8,12.3)
predictor1 <- c(4.2, 5.3, 5.68,6.5, 7.77,8.5,9.5, 10.18,11.64,12.15,14.19)
predictor2 <- c(3.1, 5.2, 6.3,7.1, 9.7,11.5,12.99, 14.5 ,15.5,16.41,17.6)
my_df <- data.frame(res, predictor1, predictor2)
model1<- lm(res~predictor1+predictor2,data = my_df)
#____Another dataset
response<- c(12.5,13.5,14.65,16.1,16.5,17.22,18.54,21.31,23.61,25.58,26.43)
x1<- c(14.21, 15.13, 16.25,16.5, 17.37,18.51,19.35, 22.18,23.64,25.12,26.19)
x2<- c(13.11, 15.22, 16.23,17.41, 18.72,21.5,22.99, 24.35 ,25.15,26.21,28.5)
observeddata <- data.frame(y, x1, x2)
#I need to check how model1 predicts the response based on the two new predictors(x1&x2) using the estimates of model1
observeddata$prediction<- predict(model1, newdata = observeddata)
#is this a good way to visulize how good or bad model1 works in case of second dataset?
ggplot(data=observeddata, aes(x=prediction,y=response))+ geom_point()
#How can I add confidence interval in this plot?
#based on what @alistaire suggested I get something like this in case of my dataset, am I doing it right?!!!
如果翻轉軸,則可以使用geom_ribbon
。 如果您告訴它也想要一個置信區間,則可以從predict
獲得必要的數字:
library(ggplot2)
my_df <- data.frame(
res = c(2,3.1,4.5,5.1,6.5,7.1,8.5,9.11,10.1,11.8,12.3),
predictor1 = c(4.2, 5.3, 5.68,6.5, 7.77,8.5,9.5, 10.18,11.64,12.15,14.19),
predictor2 = c(3.1, 5.2, 6.3,7.1, 9.7,11.5,12.99, 14.5 ,15.5,16.41,17.6))
model1<- lm(res ~ predictor1 + predictor2, data = my_df)
#____Another dataset
observeddata <- data.frame(
response = c(12.5,13.5,14.65,16.1,16.5,17.22,18.54,21.31,23.61,25.58,26.43),
predictor1 = c(14.21, 15.13, 16.25,16.5, 17.37,18.51,19.35, 22.18,23.64,25.12,26.19),
predictor2 = c(13.11, 15.22, 16.23,17.41, 18.72,21.5,22.99, 24.35 ,25.15,26.21,28.5))
# adds 3 columns (fit, lwr, upr), so use `cbind` instead of just adding a column
observeddata <- cbind(observeddata,
predict(model1, newdata = observeddata, interval = 'confidence'))
# add extra aesthetics for geom_ribbon
ggplot(data = observeddata, aes(x = response, y = fit, ymin = lwr, ymax = upr)) +
geom_point() +
geom_ribbon(alpha = .3) # set opacity so points are visible
如果您確實想要自己的軸,請添加coord_flip
。
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