1 use std::iter;
2 use std::process::Child;
3
4 use criterion_plot::prelude::*;
5
6 use super::*;
7 use crate::kde;
8 use crate::report::{BenchmarkId, ComparisonData, MeasurementData, ReportContext};
9
t_test( id: &BenchmarkId, context: &ReportContext, _measurements: &MeasurementData<'_>, comparison: &ComparisonData, size: Option<Size>, ) -> Child10 pub(crate) fn t_test(
11 id: &BenchmarkId,
12 context: &ReportContext,
13 _measurements: &MeasurementData<'_>,
14 comparison: &ComparisonData,
15 size: Option<Size>,
16 ) -> Child {
17 let t = comparison.t_value;
18 let (xs, ys) = kde::sweep(&comparison.t_distribution, KDE_POINTS, None);
19 let zero = iter::repeat(0);
20
21 let mut figure = Figure::new();
22 figure
23 .set(Font(DEFAULT_FONT))
24 .set(size.unwrap_or(SIZE))
25 .set(Title(format!(
26 "{}: Welch t test",
27 gnuplot_escape(id.as_title())
28 )))
29 .configure(Axis::BottomX, |a| a.set(Label("t score")))
30 .configure(Axis::LeftY, |a| a.set(Label("Density")))
31 .configure(Key, |k| {
32 k.set(Justification::Left)
33 .set(Order::SampleText)
34 .set(Position::Outside(Vertical::Top, Horizontal::Right))
35 })
36 .plot(
37 FilledCurve {
38 x: &*xs,
39 y1: &*ys,
40 y2: zero,
41 },
42 |c| {
43 c.set(DARK_BLUE)
44 .set(Label("t distribution"))
45 .set(Opacity(0.25))
46 },
47 )
48 .plot(
49 Lines {
50 x: &[t, t],
51 y: &[0, 1],
52 },
53 |c| {
54 c.set(Axes::BottomXRightY)
55 .set(DARK_BLUE)
56 .set(LINEWIDTH)
57 .set(Label("t statistic"))
58 .set(LineType::Solid)
59 },
60 );
61
62 let path = context.report_path(id, "change/t-test.svg");
63 debug_script(&path, &figure);
64 figure.set(Output(path)).draw().unwrap()
65 }
66
