1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.statistics.inference;
18
19 /**
20 * Represents an assumption on the dispersion of data.
21 *
22 * @see <a href="https://en.wikipedia.org/wiki/Homoscedasticity_and_heteroscedasticity">
23 * Homoscedasticity and heteroscedasticity (Wikipedia)</a>
24 * @since 1.1
25 */
26 public enum DataDispersion {
27 /**
28 * All data has the same finite variance (homogeneity of variance).
29 */
30 HOMOSCEDASTIC,
31
32 /**
33 * Data does not have the same variance.
34 */
35 HETEROSCEDASTIC
36 }