Coloring data in ggplot using two factor columns

[Sabraham]

I have two columns that I want to use to color my data in ggplot. The first one just categorizes the data in two two groups and the second one tells if the data is an outlier or not. Is there anyway I can color my data in ggplot using both columns. Below is the part of the code I used

geom_point(aes(color=factor(column1)))+scale_Colour_manual(values=c("blue","green"))+

geom_point(aes(color=factor(column2)))+scale_colour_manual(values=c("red","yellow"))

 

but below is the error I get

Scale for 'colour' is already present. Adding another scale for 'colour', which will replace the existing scale.

Thanks,

S

[Moritz Emanuel Beber]

Hi,

I think you would have to combine the two factors to one, so that you actually get four different possible groups and assign colours accordingly. Check out the 'interaction' function to do that.

Thanks,

S

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Best,
Moritz

[zelfortin]

Hi,

you could also change the shape of the points based on the first factor and change the color based on the other factor.

e.g.

geom_point(aes(color=factor(column1), shape=factor(column2)))+scale_Colour_manual(values=c("blue","green"))

and then you can use
+ scale_shape_manual(values=c(1,2))

It seems like a more efficient way of showing your two factors.

Hope this helps.

Cheers!

JMF
University of Ottawa