R - ggplot - jitter plot with transparent data points

Question

I want to get a jitter plot with transparent data points and I use this code:

p<-ggplot(house_data,aes(x=cloudCover, y=solar_energy, color = day_night)) 
p<-p+geom_jitter()
p<-p+geom_point(alpha = 0.01)
p

I get a jitter plot but unfortunately I do not get transparent data points. I experimented with different values for alpha but the plot stays the same... What is wrong with my code?

ggplot(<as as above>) + geom_jitter(alpha = .01) should work too. — mrhellmann
– mrhellmann, Commented Jan 15, 2021 at 19:08
it would be helpful to have some sort of example data. I'm guessing cloudCover and solar_energy are discreet and day_night is categorical / binary? What are you trying to achieve? To call geom_points and geom_jitter on the same data does not make sense to me, as one is better suited for a discreet y-axis (geom_points()) and one for categorical data (geom_jitter()). — randomchars42
– randomchars42, Commented Jan 15, 2021 at 19:13
Yes, this was the problem @randomchars42. And you are also right regarding the types of the variables. The first comment solved the problem :-) Thanks! — Tobitor
– Tobitor, Commented Jan 15, 2021 at 19:15

DaveArmstrong · Accepted Answer · 2021-01-15 19:02:15Z

2

You should be able to use position_jitter in the point geometry. The width and height parameters are the amount of jitter on the x- and y-axes respectively:

p<-ggplot(house_data,aes(x=cloudCover, y=solar_energy, color = day_night)) 
p<-p+geom_point(alpha = 0.01, position=position_jitter(height=.5, width=.5))
p

answered Jan 15, 2021 at 19:02

DaveArmstrong

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