Faceted regression
Regression lines grouped by a categorical variable, with different colors for each group.
<Plot grid frame aspectRatio={1} inset={5}>
<Dot
data={penguins}
x="culmen_length_mm"
y="culmen_depth_mm"
fill="#999"
opacity={0.2} />
<Dot
data={penguins}
x="culmen_length_mm"
fx="species"
y="culmen_depth_mm"
fill="species" />
<RegressionY
data={penguins}
x="culmen_length_mm"
fx="species"
y="culmen_depth_mm"
stroke="species" />
</Plot>