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POggplot2 - How to boxplot two variables with different scales on same plot using a primary and secondary y-axis?
 

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  1. POggplot2 - How to boxplot two variables with different scales on same plot using a primary and secondary y-axis?
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    <p>Datalink:</p> <p><a href="https://www.dropbox.com/s/kdi5uklhylr8vei/GTAP_DistEVYield.csv?m" rel="nofollow noreferrer">Data</a></p> <p>Code:</p> <pre><code> distevyield &lt;- read.csv(file = "F:/Purdue University/RA_Position/PhD_ResearchandDissert/PhD_Draft/GTAP-CGE/GTAP_NewAggDatabase/NewFiles/GTAP_DistEVYield.csv", header=TRUE, sep=",", na.string="NA", dec=".", strip.white=TRUE) str(distevyield) distevyield &lt;- as.data.frame(distevyield) distevyield[5:6] &lt;- sapply(distevyield[5:6],as.numeric) distevyield &lt;- droplevels(distevyield) distevyield &lt;- transform(distevyield,region=factor(region,levels=unique(region))) library(ggplot2) distevyield.f &lt;- melt(subset(distevyield, region !="World")) Figure3 &lt;- ggplot(data = distevyield.f, aes(factor(variable), value)) Figure3 + geom_boxplot() + theme(axis.text.x = element_text(colour = 'black', angle = 90, size = 15, hjust = 1, vjust = 0.5),axis.title.x = element_blank()) + theme(axis.text.y = element_text(colour = 'black', size = 15, hjust = 0.5, vjust = 0.5), axis.title.y = element_blank()) + theme(strip.text.x = element_text(size = 14, hjust = 0.5, vjust = 0.5, face = 'bold')) + facet_wrap(~region, scales="free_y") </code></pre> <p>Outcome: <img src="https://i.stack.imgur.com/hktEk.png" alt="Plot result"></p> <p>Question:</p> <p>My two variables plotted, yield (%change) and ev (in million US$) have different units. Is there a way to add a secondary y-axis for one of the variable so as to display each variable with a boxplot representing its original units, but within the same plot? Does this feature exist in ggplot2 to begin with?</p> <p>Thanks!</p>
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    1. USJulius Vainora
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    1. COWhy would you use `scales='free_y'` with boxplots? It make comparison fairly difficult...
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