Grouped regression
Regression lines grouped by a categorical variable, with different colors for each group. Based on an example from Observable Plot.
<Plot grid height={500} color={{ legend: true }}>
<Dot
data={penguins}
x="culmen_length_mm"
y="culmen_depth_mm"
fill="species" />
<RegressionY
data={penguins}
x="culmen_length_mm"
y="culmen_depth_mm" />
<RegressionY
data={penguins}
x="culmen_length_mm"
y="culmen_depth_mm"
stroke="species" />
</Plot>