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/*
* DSI utilities
*
* Copyright (C) 2011-2023 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* 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.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.stat;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import org.junit.Test;
public class JackknifeTest {
@Test
public void test() {
final ArrayList<double[]> samples = new ArrayList<>();
samples.add(new double[] { 1 });
samples.add(new double[] { 2 });
samples.add(new double[] { 3 });
// Linear statistics must pass through the jackknife without bias.
final Jackknife average = Jackknife.compute(samples, Jackknife.IDENTITY);
assertEquals(2, average.estimate[0], 1E-30);
assertEquals(Math.sqrt(((1 - 2) * (1 - 2) + (3 - 2) * (3 - 2)) / 6.), average.standardError[0], 1E-30);
}
}
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