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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  }