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How to create scatterplot with intercept equals to 1 using ggplot2 in R?
To create a scatterplot with intercept equals to 1 using ggplot2, we can use geom_abline function but we need to pass the appropriate limits for the x axis and y axis values. For example, if we have two columns x and y in a data frame df and both have ranges starting from 0 to 5 then the scatterplot with intercept equals to 1 can be created as −
ggplot(df,aes(x,y))+geom_point()+geom_abline(intercept=1)+lims(x=c(0,5),y=c(0,5))
Example
Consider the below data frame −
x<-rnorm(20,5,1.12) y<-rnorm(20,1,0.035) df<-data.frame(x,y) df
Output
x y 1 2.687278 0.9948582 2 4.410082 0.9646977 3 1.985577 0.9691989 4 8.218845 1.0174078 5 5.942984 0.9926087 6 4.346328 1.0340842 7 5.674543 0.9684308 8 6.138125 0.9891907 9 4.392059 0.9342166 10 8.028985 0.9871115 11 5.184612 1.0310949 12 3.896205 0.9636961 13 4.500758 0.9725633 14 6.950320 1.0140455 15 6.640275 0.9414716 16 7.071293 1.0262039 17 5.675679 1.0348059 18 4.104087 1.0214097 19 4.254315 0.9187824 20 4.585728 1.0420679
Loading ggplot2 package and the scatterplot with regression line having intercept equals to 1 −
Example
library(ggplot2) ggplot(df,aes(x,y))+geom_point()+geom_abline(intercept=1)+lims(x=c(0,9),y=c(0,2))
Output
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