1 | use super::*; |
2 | use crate::report::ComparisonData; |
3 | use std::path::Path; |
4 | |
5 | pub(crate) fn t_test( |
6 | path: &Path, |
7 | title: &str, |
8 | comparison: &ComparisonData, |
9 | size: Option<(u32, u32)>, |
10 | ) { |
11 | let t = comparison.t_value; |
12 | let (xs, ys) = kde::sweep(&comparison.t_distribution, KDE_POINTS, None); |
13 | |
14 | let x_range = plotters::data::fitting_range(xs.iter()); |
15 | let mut y_range = plotters::data::fitting_range(ys.iter()); |
16 | y_range.start = 0.0; |
17 | y_range.end *= 1.1; |
18 | |
19 | let root_area = SVGBackend::new(&path, size.unwrap_or(SIZE)).into_drawing_area(); |
20 | |
21 | let mut chart = ChartBuilder::on(&root_area) |
22 | .margin((5).percent()) |
23 | .caption(format!("{}: Welch t test" , title), (DEFAULT_FONT, 20)) |
24 | .set_label_area_size(LabelAreaPosition::Left, (5).percent_width().min(60)) |
25 | .set_label_area_size(LabelAreaPosition::Bottom, (5).percent_height().min(40)) |
26 | .build_cartesian_2d(x_range, y_range.clone()) |
27 | .unwrap(); |
28 | |
29 | chart |
30 | .configure_mesh() |
31 | .disable_mesh() |
32 | .y_desc("Density" ) |
33 | .x_desc("t score" ) |
34 | .draw() |
35 | .unwrap(); |
36 | |
37 | chart |
38 | .draw_series(AreaSeries::new( |
39 | xs.iter().zip(ys.iter()).map(|(x, y)| (*x, *y)), |
40 | 0.0, |
41 | DARK_BLUE.mix(0.25), |
42 | )) |
43 | .unwrap() |
44 | .label("t distribution" ) |
45 | .legend(|(x, y)| { |
46 | Rectangle::new([(x, y - 5), (x + 20, y + 5)], DARK_BLUE.mix(0.25).filled()) |
47 | }); |
48 | |
49 | chart |
50 | .draw_series(std::iter::once(PathElement::new( |
51 | vec![(t, 0.0), (t, y_range.end)], |
52 | DARK_BLUE.filled().stroke_width(2), |
53 | ))) |
54 | .unwrap() |
55 | .label("t statistic" ) |
56 | .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], DARK_BLUE)); |
57 | |
58 | chart.configure_series_labels().draw().unwrap(); |
59 | } |
60 | |