stat-qq
Q-Q statistic: theoretical-vs-sample pairs against a reference distribution.
Reads the sample aesthetic from the mapping; if sample is absent the statistic falls back to y. Non-numeric and none values are dropped. Output rows are sorted by sample ascending, with theoretical taken from theoretical-quantile((i + 0.5) / n, distribution) for i in 0..n. Supported reference distributions are "normal" (default), "uniform", and "exponential".
Usage
stat-qq()Returns
Statistic object with name: "qq", consumed by geom layers.
Outputs
theoretical.sample.
Examples
Q-Q points against a normal reference, mapping y only.
#let d = (1, 2, 3, 4, 5).map(v => (v: v))
#plot(
data: d,
mapping: aes(y: "v"),
layers: (geom-qq(),),
width: 10cm,
height: 6cm,
)
Constructor form: stat: stat-qq() is equivalent to stat: "qq" with defaults.
#let d = range(1, 21).map(i => (v: i + calc.sin(i)))
#plot(
data: d,
mapping: aes(y: "v"),
layers: (geom-point(stat: stat-qq(), size: 2pt), geom-qq-line(stroke: 1pt)),
width: 10cm,
height: 6cm,
)
