Web Reference: Sep 24, 2025 · Why it happens The plot is trying to display too much information at once. It's a visual overload. Solution Simplify! If your factors have many levels, consider collapsing some of them into broader categories or subsetting your data to focus on a few key levels at a time. Nov 29, 2013 · Note that this "error" is not an actual error, it plots the legend as it is intended to look, there is not a single actual line that should be plotted according to your aesthetics and stats. Jan 17, 2017 · In sum, ggplot2 provides some handy functions for visualizing moderator effects. In addition to traditional regression analyses, such plots can help to better grasp what actually is going on.
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