I'm using Orange Canvas and I generated a scatter plot. I have the possibility to jitter continuous variables but I really don't know why would I do that.
What's the idea behind jittering?
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This post explains it well.
Often when you have a lot of overlapping points it can be hard to get a sense for their density. Two thousand points at (1, 1) appear the same as one point at (1, 1). Adding some jitter turns overlapping points into a smear and makes the density of points obvious.