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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN""http://www.w3.org/TR/REC-html40/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Sep 11 11:26:55 BST 2003 --><TITLE>Statistics (JFreeChart Class Library (version 0.9.12))</TITLE><META NAME="keywords" CONTENT="org.jfree.data.statistics.Statistics,Statistics class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"></HEAD><SCRIPT>function asd(){parent.document.title="Statistics (JFreeChart Class Library (version 0.9.12))";}</SCRIPT><BODY BGCOLOR="white" onload="asd();"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A 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CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/jfree/data/statistics/DefaultStatisticalCategoryDataset.html"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Statistics.html" TARGET="_top"><B>NO FRAMES</B></A> <SCRIPT> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT><A HREF="../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.jfree.data.statistics</FONT><BR>Class Statistics</H2><PRE>java.lang.Object | +--<B>org.jfree.data.statistics.Statistics</B></PRE><HR><DL><DT>public class <B>Statistics</B><DT>extends java.lang.Object</DL><P>A utility class that provides some simple statistical functions.<P><P><DL><DT><B>Author:</B></DT> <DD>Matthew Wright</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#Statistics()">Statistics</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getAverage(java.lang.Number[])">getAverage</A></B>(java.lang.Number[] data)</CODE><BR> Returns the average of a set of numbers.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getCorrelation(java.lang.Number[], java.lang.Number[])">getCorrelation</A></B>(java.lang.Number[] data1, java.lang.Number[] data2)</CODE><BR> Calculates the correlation between two datasets.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getLinearFit(java.lang.Number[], java.lang.Number[])">getLinearFit</A></B>(java.lang.Number[] xData, java.lang.Number[] yData)</CODE><BR> Fits a straight line to a set of (x, y) data, returning the slope and intercept.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double[][]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getMovingAverage(java.lang.Number[], java.lang.Number[], int)">getMovingAverage</A></B>(java.lang.Number[] xData, java.lang.Number[] yData, int period)</CODE><BR> Returns a data set for a moving average on the data set passed in.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getSlope(java.lang.Number[], java.lang.Number[])">getSlope</A></B>(java.lang.Number[] xData, java.lang.Number[] yData)</CODE><BR> Finds the slope of a regression line using least squares.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jfree/data/statistics/Statistics.html#getStdDev(java.lang.Number[])">getStdDev</A></B>(java.lang.Number[] data)</CODE><BR> Returns the standard deviation of a set of numbers.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="Statistics()"><!-- --></A><H3>Statistics</H3><PRE>public <B>Statistics</B>()</PRE><DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="getAverage(java.lang.Number[])"><!-- --></A><H3>getAverage</H3><PRE>public static double <B>getAverage</B>(java.lang.Number[] data)</PRE><DL><DD>Returns the average of a set of numbers.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>data</CODE> - the data.<DT><B>Returns:</B><DD>the average of a set of numbers.</DL></DD></DL><HR><A NAME="getStdDev(java.lang.Number[])"><!-- --></A><H3>getStdDev</H3><PRE>public static double <B>getStdDev</B>(java.lang.Number[] data)</PRE><DL><DD>Returns the standard deviation of a set of numbers.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>data</CODE> - the data.<DT><B>Returns:</B><DD>the standard deviation of a set of numbers.</DL></DD></DL><HR><A NAME="getLinearFit(java.lang.Number[], java.lang.Number[])"><!-- --></A><H3>getLinearFit</H3><PRE>public static double[] <B>getLinearFit</B>(java.lang.Number[] xData, java.lang.Number[] yData)</PRE><DL><DD>Fits a straight line to a set of (x, y) data, returning the slope and intercept.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>xData</CODE> - the x-data.<DD><CODE>yData</CODE> - the y-data.<DT><B>Returns:</B><DD>a double array with the intercept in [0] and the slope in [1].</DL></DD></DL><HR><A NAME="getSlope(java.lang.Number[], java.lang.Number[])"><!-- --></A><H3>getSlope</H3><PRE>public static double <B>getSlope</B>(java.lang.Number[] xData, java.lang.Number[] yData)</PRE><DL><DD>Finds the slope of a regression line using least squares.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>xData</CODE> - an array of Numbers (the x values).<DD><CODE>yData</CODE> - an array of Numbers (the y values).<DT><B>Returns:</B><DD>the slope.</DL></DD></DL><HR><A NAME="getCorrelation(java.lang.Number[], java.lang.Number[])"><!-- --></A><H3>getCorrelation</H3><PRE>public static double <B>getCorrelation</B>(java.lang.Number[] data1, java.lang.Number[] data2)</PRE><DL><DD>Calculates the correlation between two datasets.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>data1</CODE> - the first dataset.<DD><CODE>data2</CODE> - the second dataset.<DT><B>Returns:</B><DD>the correlation between two datasets.</DL></DD></DL><HR><A NAME="getMovingAverage(java.lang.Number[], java.lang.Number[], int)"><!-- --></A><H3>getMovingAverage</H3><PRE>public static double[][] <B>getMovingAverage</B>(java.lang.Number[] xData, java.lang.Number[] yData, int period)</PRE><DL><DD>Returns a data set for a moving average on the data set passed in.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>xData</CODE> - an array of the x data.<DD><CODE>yData</CODE> - an array of the y data.<DD><CODE>period</CODE> - the number of data points to average<DT><B>Returns:</B><DD>a double[][] the length of the data set in the first dimension, with two doubles for x and y in the second dimension</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR 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ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/jfree/data/statistics/DefaultStatisticalCategoryDataset.html"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Statistics.html" TARGET="_top"><B>NO FRAMES</B></A> <SCRIPT> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT><A HREF="../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A 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