Combining Bar and Line chart (double axis) in ggplot2

Question

I have double-y-axis chart made in Excel. In Excel it requires only basic skills. What I'd like to do is to replicate this chart using the ggplot2 library in R.

I have already done this, but I need to plot Response on 2nd-y-axis.

I enclose reproducible code I've used:

#Data generation Year <- c(2014, 2015, 2016) Response <- c(1000, 1100, 1200) Rate <- c(0.75, 0.42, 0.80) df <- data.frame(Year, Response, Rate) #Chart library(ggplot2) ggplot(df) + geom_bar(aes(x=Year, y=Response),stat="identity", fill="tan1", colour="sienna3")+ geom_line(aes(x=Year, y=Rate),stat="identity")+ geom_text(aes(label=Rate, x=Year, y=Rate), colour="black")+ geom_text(aes(label=Response, x=Year, y=0.9*Response), colour="black")

setempler · Accepted Answer · 2017-01-20 13:15:59Z

First, scale Rate by Rate*max(df$Response) and modify the 0.9 scale of Response text.

Second, include a second axis via scale_y_continuous(sec.axis=...):

ggplot(df) + geom_bar(aes(x=Year, y=Response),stat="identity", fill="tan1", colour="sienna3")+ geom_line(aes(x=Year, y=Rate*max(df$Response)),stat="identity")+ geom_text(aes(label=Rate, x=Year, y=Rate*max(df$Response)), colour="black")+ geom_text(aes(label=Response, x=Year, y=0.95*Response), colour="black")+ scale_y_continuous(sec.axis = sec_axis(~./max(df$Response)))

Which yields:

Hello, how can I change the limits of the secondary y axis? I am trying to create a similar graph with percentage (already multiplied by 100) and the scale on the secondary graph is not appropriate. Thanks!
I had the same problem as @user3047435. A lot of things I tried messed up the scaling, so for e.g. the Rate would be right but the Response was thrown out. Ultimately, I ended up taking the original percentage back down to being divided by 100, but then multiplied it again in the scaling, like so: scale_y_continuous(sec.axis = sec_axis(~./max(df$Response)*100)).

Rishabh Chakraborty · Accepted Answer · 2021-06-15 14:18:18Z

Use the syntax label=scales::percent to make the secondary axis into percentage : Click Here for Output

library(ggplot2) ggplot(df) + geom_bar(aes(x=Year, y=Response),stat="identity", fill="tan1", colour="sienna3")+ geom_line(aes(x=Year, y=Rate*max(df$Response)),stat="identity")+ geom_text(aes(label=Rate, x=Year, y=Rate*max(df$Response)), colour="black")+ geom_text(aes(label=Response, x=Year, y=0.95*Response), colour="black")+ scale_y_continuous(sec.axis = sec_axis(~./max(df$Response),label=scales::percent))

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