plot count of values by factor in ggplot

Question

New to R, stuck googling this (probably easy) thing for too long.

I want to plot the proportion of males that fathered offspring, according to whether they have a nest or not. (I don't want the information of how many offspring they fathered). This is my dataset called "males"

fishID nest off
fish1    1  25
fish2    0   0
fish3    0   5
fish4    1  15
fish5    1   0
fish6    0   2
fish7    0   0
fish8    1   4

I've used the following code to change the values of offspring to 0 and 1 (though this feels clumsy already)...

#converts the values in offspring to 0 and 1s
vars=c("off")
males[males$off != "0", vars]="1"
males

...and I can plot proportions using...

ggplot(males,aes(x = males$nest,fill = males$off)) + 
geom_bar(position = "fill")

...but I would like to colour them so that 0 (no nest) is one colour and 1 (nest) is another colour, then the proportion of males that didn't father offspring is a paler version of each colour. The above produces colours according to "offspring", irrespective of "nest".

Tips welcome. (Mac OS X, R 3.0.3 GUI 1.63 Snow Leopard build (6660))

males$off <- factor(as.numeric(males$off != 0))

alistaire
– alistaire

2016-03-16 02:02:31 +00:00
Commented Mar 16, 2016 at 2:02 — alistaire
– alistaire, Commented Mar 16, 2016 at 2:02
thank you, adding that to my growing library.

spottydog
– spottydog

2016-03-16 09:25:01 +00:00
Commented Mar 16, 2016 at 9:25 — spottydog
– spottydog, Commented Mar 16, 2016 at 9:25

ytk · Accepted Answer · 2016-03-16 01:51:57Z

1

Is this what you're looking for?

library(ggplot2)

males$nest <- as.factor(males$nest)
males$off <- as.factor(males$off)

ggplot(males, aes(x = nest, fill = off)) + 
geom_bar(width = 0.25) + 
scale_fill_manual(values = c('green', 'darkgreen'))

answered Mar 16, 2016 at 1:51

ytk

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spottydog Over a year ago

Almost... I would like the two columns to be coloured according to if they have a nest or not e.g. 0 nest, green and light green, 1 nest, blue and light blue.

spottydog · Accepted Answer · 2016-03-16 10:54:27Z

1

Done it! Thank you. It was the fill by interaction I was missing.

require(ggplot2)

males$off <- factor(as.numeric(males$off != 0))
males$nest <- as.factor(males$nest)

ggplot(males, aes(x = nest, fill = interaction(males$nest, males$off))) + geom_bar(width = 0.25) + scale_fill_manual(values = c('deepskyblue3', 'tomato3', 'deepskyblue', 'tomato'))

(Eventually needed the same number of lines of code as days googling...)

answered Mar 16, 2016 at 10:54

spottydog

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