R散点图矩阵小比例尺

Question

I have a dataframe of 4 variables and let's say 100 entries. This variables are dummies that varies in small scales (1-5). Is there a way to acknowledge the density of the points plotted in the scatterplot? By having my points varying only between 1,2,3,4,& 5 many of them are located at the same place therefore I cannot see a pattern emerging as they are perfectly overlapping.

Answer 1

A first possibility would be to use jitter ; and a second to use transparent Colors:

set.seed(1)
df <- data.frame(var1 = sample(1:5, size = 100, replace = TRUE),
                 var2 = sample(1:5, size = 100, replace = TRUE))

plot(jitter(var1) ~ jitter(var2), data = df)

plot(var1 ~ var2, data = df, col = "#20000050")