Add test for turnbull

tests/turnbull.rs

@@ -0,0 +1,68 @@
+// hpstat: High-performance statistics implementations
+// Copyright © 2023  Lee Yingtong Li (RunasSudo)
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+// 
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use indicatif::ProgressBar;
+
+use hpstat::turnbull;
+
+#[test]
+fn test_turnbull_minitab() {
+	// Compare "mufflers" example with Minitab output
+	
+	let data_times = turnbull::read_data("tests/minitab.csv");
+	
+	// Fit regression
+	let progress_bar = ProgressBar::hidden();
+	let result = turnbull::fit_turnbull(data_times, progress_bar, 500, 0.0001);
+	
+	assert_eq!(result.failure_intervals[0], (20000.0, 30000.0));
+	assert_eq!(result.failure_intervals[1], (30000.0, 40000.0));
+	assert_eq!(result.failure_intervals[2], (40000.0, 50000.0));
+	assert_eq!(result.failure_intervals[3], (50000.0, 60000.0));
+	assert_eq!(result.failure_intervals[4], (60000.0, 70000.0));
+	assert_eq!(result.failure_intervals[5], (70000.0, 80000.0));
+	assert_eq!(result.failure_intervals[6], (80000.0, 90000.0));
+	assert_eq!(result.failure_intervals[7], (90000.0, f64::INFINITY));
+	
+	assert!(abs_diff(result.failure_prob[0], 0.002860) < 0.000001);
+	assert!(abs_diff(result.failure_prob[1], 0.010486) < 0.000001);
+	assert!(abs_diff(result.failure_prob[2], 0.032412) < 0.000001);
+	assert!(abs_diff(result.failure_prob[3], 0.102955) < 0.000001);
+	assert!(abs_diff(result.failure_prob[4], 0.170639) < 0.000001);
+	assert!(abs_diff(result.failure_prob[5], 0.248808) < 0.000001);
+	assert!(abs_diff(result.failure_prob[6], 0.231649) < 0.000001);
+	assert!(abs_diff(result.failure_prob[7], 0.200191) < 0.000001);
+	
+	assert!(abs_diff(result.survival_prob[0], 0.997140) < 0.000001);
+	assert!(abs_diff(result.survival_prob[1], 0.986654) < 0.000001);
+	assert!(abs_diff(result.survival_prob[2], 0.954242) < 0.000001);
+	assert!(abs_diff(result.survival_prob[3], 0.851287) < 0.000001);
+	assert!(abs_diff(result.survival_prob[4], 0.680648) < 0.000001);
+	assert!(abs_diff(result.survival_prob[5], 0.431840) < 0.000001);
+	assert!(abs_diff(result.survival_prob[6], 0.200191) < 0.000001);
+	
+	assert!(abs_diff(result.survival_prob_se[0], 0.0016488) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[1], 0.0035430) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[2], 0.0064517) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[3], 0.0109856) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[4], 0.0143949) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[5], 0.0152936) < 0.0000001);
+	assert!(abs_diff(result.survival_prob_se[6], 0.0123546) < 0.0000001);
+}
+
+fn abs_diff(a: f64, b: f64) -> f64 {
+	return (a - b).abs();
+}