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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.stat.ranking;
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* Strategies for handling NaN values in rank transformations.
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* <li>MINIMAL - NaNs are treated as minimal in the ordering, equivalent to
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* (that is, tied with) <code>Double.NEGATIVE_INFINITY</code>.</li>
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* <li>MAXIMAL - NaNs are treated as maximal in the ordering, equivalent to
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* <code>Double.POSITIVE_INFINITY</code></li>
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* <li>REMOVED - NaNs are removed before the rank transform is applied</li>
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* <li>FIXED - NaNs are left "in place," that is the rank transformation is
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* applied to the other elements in the input array, but the NaN elements
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* are returned unchanged.</li>
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* @version $Revision: 799857 $ $Date: 2009-08-01 09:07:12 -0400 (Sat, 01 Aug 2009) $
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public enum NaNStrategy {
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/** NaNs are considered minimal in the ordering */
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/** NaNs are considered maximal in the ordering */
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/** NaNs are removed before computing ranks */
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/** NaNs are left in place */