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AttributeStats.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 4k
Category:
Windows Develop
Development Platform:
Java
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * AttributeStats.java
- * Copyright (C) 1999 Len Trigg
- *
- */
- package weka.core;
- import java.io.Serializable;
- /**
- * A Utility class that contains summary information on an
- * the values that appear in a dataset for a particular attribute.
- *
- * @author <a href="mailto:len@webmind.com">Len Trigg</a>
- * @version $Revision: 1.6 $
- */
- public class AttributeStats implements Serializable {
- /** The number of int-like values */
- public int intCount = 0;
- /** The number of real-like values (i.e. have a fractional part) */
- public int realCount = 0;
- /** The number of missing values */
- public int missingCount = 0;
- /** The number of distinct values */
- public int distinctCount = 0;
- /** The number of values that only appear once */
- public int uniqueCount = 0;
- /** The total number of values (i.e. number of instances) */
- public int totalCount = 0;
- /** Stats on numeric value distributions */
- // perhaps Stats should be moved from weka.experiment to weka.core
- public weka.experiment.Stats numericStats;
- /** Counts of each nominal value */
- public int [] nominalCounts;
- /**
- * Updates the counters for one more observed distinct value.
- *
- * @param value the value that has just been seen
- * @param count the number of times the value appeared
- */
- protected void addDistinct(double value, int count) {
- if (count > 0) {
- if (count == 1) {
- uniqueCount++;
- }
- if (Utils.eq(value, (double)((int)value))) {
- intCount += count;
- } else {
- realCount += count;
- }
- if (nominalCounts != null) {
- nominalCounts[(int)value] = count;
- }
- if (numericStats != null) {
- numericStats.add(value, count);
- numericStats.calculateDerived();
- }
- }
- distinctCount++;
- }
- /**
- * Returns a human readable representation of this AttributeStats instance.
- *
- * @return a String represtinging these AttributeStats.
- */
- public String toString() {
- StringBuffer sb = new StringBuffer();
- sb.append(Utils.padLeft("Type", 4)).append(Utils.padLeft("Nom", 5));
- sb.append(Utils.padLeft("Int", 5)).append(Utils.padLeft("Real", 5));
- sb.append(Utils.padLeft("Missing", 12));
- sb.append(Utils.padLeft("Unique", 12));
- sb.append(Utils.padLeft("Dist", 6));
- if (nominalCounts != null) {
- sb.append(' ');
- for (int i = 0; i < nominalCounts.length; i++) {
- sb.append(Utils.padLeft("C[" + i + "]", 5));
- }
- }
- sb.append('n');
- long percent;
- percent = Math.round(100.0 * intCount / totalCount);
- if (nominalCounts != null) {
- sb.append(Utils.padLeft("Nom", 4)).append(' ');
- sb.append(Utils.padLeft("" + percent, 3)).append("% ");
- sb.append(Utils.padLeft("" + 0, 3)).append("% ");
- } else {
- sb.append(Utils.padLeft("Num", 4)).append(' ');
- sb.append(Utils.padLeft("" + 0, 3)).append("% ");
- sb.append(Utils.padLeft("" + percent, 3)).append("% ");
- }
- percent = Math.round(100.0 * realCount / totalCount);
- sb.append(Utils.padLeft("" + percent, 3)).append("% ");
- sb.append(Utils.padLeft("" + missingCount, 5)).append(" /");
- percent = Math.round(100.0 * missingCount / totalCount);
- sb.append(Utils.padLeft("" + percent, 3)).append("% ");
- sb.append(Utils.padLeft("" + uniqueCount, 5)).append(" /");
- percent = Math.round(100.0 * uniqueCount / totalCount);
- sb.append(Utils.padLeft("" + percent, 3)).append("% ");
- sb.append(Utils.padLeft("" + distinctCount, 5)).append(' ');
- if (nominalCounts != null) {
- for (int i = 0; i < nominalCounts.length; i++) {
- sb.append(Utils.padLeft("" + nominalCounts[i], 5));
- }
- }
- sb.append('n');
- return sb.toString();
- }
- }