geom-qq-line
Q-Q reference line layer fitted through the IQR of the sample.
The sample aesthetic selects the column whose 25th and 75th quantiles anchor the line; when sample is absent the layer falls back to y. The reference distribution is selected via distribution and must match the matching geom-qq layer.
Usage
geom-qq-line(
mapping: none,
data: none,
stroke: 0.8pt,
colour: auto,
alpha: auto,
linetype: auto,
distribution: "normal",
position: "identity",
inherit-aes: true,
)Parameters
| Parameter | Default | Description |
|---|---|---|
mapping |
none |
Layer-specific aesthetic mapping built with aes. Falls back to the plot mapping when none. |
data |
none |
Layer-specific dataset. Falls back to the plot data when none. |
stroke |
0.8pt |
Line thickness (a Typst length). |
colour |
auto |
Fixed line colour. auto resolves via the colour scale or a neutral default. |
alpha |
auto |
Line opacity in [0, 1]. |
linetype |
auto |
Dash keyword. auto honours the linetype scale. |
distribution |
"normal" |
Reference distribution name; one of "normal" (default), "uniform", "exponential". |
position |
"identity" |
Position adjustment name. Usually "identity". |
inherit-aes |
true |
Whether to merge the plot-level mapping into this layer’s mapping. |
Returns
Layer dictionary consumed by plot.
Examples
Reference line under geom-qq for a normal Q-Q plot.
#let d = (1, 2, 3, 4, 5).map(v => (v: v))
#plot(
data: d,
mapping: aes(y: "v"),
layers: (geom-qq(), geom-qq-line()),
width: 10cm,
height: 6cm,
)
Distinguish the line by colour and dash to keep it visible over the points.
#let d = range(1, 21).map(i => (v: i + calc.sin(i)))
#plot(
data: d,
mapping: aes(y: "v"),
layers: (
geom-qq(size: 2pt),
geom-qq-line(colour: rgb("#cc0000"), stroke: 1pt, linetype: "dashed"),
),
width: 10cm,
height: 6cm,
)
