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JFreeChart 9.20的文档 需要用JAVA在网页上做统计图的东东

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public <B>Statistics</B>()</PRE>
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<B>Method Detail</B></FONT></TD>
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<A NAME="calculateMean(java.lang.Number[])"><!-- --></A><H3>
calculateMean</H3>
<PRE>
public static double <B>calculateMean</B>(java.lang.Number[]&nbsp;values)</PRE>
<DL>
<DD>Returns the mean of an array of numbers.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values (<code>null</code> permitted, returns <code>Double.NaN</code>).
<DT><B>Returns:</B><DD>The mean.</DL>
</DD>
</DL>
<HR>

<A NAME="calculateMean(java.util.Collection)"><!-- --></A><H3>
calculateMean</H3>
<PRE>
public static double <B>calculateMean</B>(java.util.Collection&nbsp;values)</PRE>
<DL>
<DD>Returns the mean of a collection of <code>Number</code> objects.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values (<code>null</code> permitted, returns <code>Double.NaN</code>).
<DT><B>Returns:</B><DD>The mean.</DL>
</DD>
</DL>
<HR>

<A NAME="calculateMedian(java.util.List)"><!-- --></A><H3>
calculateMedian</H3>
<PRE>
public static double <B>calculateMedian</B>(java.util.List&nbsp;values)</PRE>
<DL>
<DD>Calculates the median for a list of values (<code>Number</code> objects).  The list
 of values will be sorted first.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values.
<DT><B>Returns:</B><DD>The median.</DL>
</DD>
</DL>
<HR>

<A NAME="calculateMedian(java.util.List, boolean)"><!-- --></A><H3>
calculateMedian</H3>
<PRE>
public static double <B>calculateMedian</B>(java.util.List&nbsp;values,
                                     boolean&nbsp;copyAndSort)</PRE>
<DL>
<DD>Calculates the median for a list of values (<code>Number</code> objects) that are assumed
 to be in ascending order.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values.<DD><CODE>copyAndSort</CODE> - a flag that controls whether the list of values is copied and sorted.
<DT><B>Returns:</B><DD>The median.</DL>
</DD>
</DL>
<HR>

<A NAME="calculateMedian(java.util.List, int, int)"><!-- --></A><H3>
calculateMedian</H3>
<PRE>
public static double <B>calculateMedian</B>(java.util.List&nbsp;values,
                                     int&nbsp;start,
                                     int&nbsp;end)</PRE>
<DL>
<DD>Calculates the median for a sublist within a list of values (<code>Number</code> objects).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values (in any order).<DD><CODE>start</CODE> - the start index.<DD><CODE>end</CODE> - the end index.
<DT><B>Returns:</B><DD>The median.</DL>
</DD>
</DL>
<HR>

<A NAME="calculateMedian(java.util.List, int, int, boolean)"><!-- --></A><H3>
calculateMedian</H3>
<PRE>
public static double <B>calculateMedian</B>(java.util.List&nbsp;values,
                                     int&nbsp;start,
                                     int&nbsp;end,
                                     boolean&nbsp;copyAndSort)</PRE>
<DL>
<DD>Calculates the median for a sublist within a list of values (<code>Number</code> objects).
 The entire list will be sorted if the <code>ascending</code< argument is <code>false</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values.<DD><CODE>start</CODE> - the start index.<DD><CODE>end</CODE> - the end index.<DD><CODE>copyAndSort</CODE> - a flag that that controls whether the list of values is copied and 
                     sorted.
<DT><B>Returns:</B><DD>The median.</DL>
</DD>
</DL>
<HR>

<A NAME="getStdDev(java.lang.Number[])"><!-- --></A><H3>
getStdDev</H3>
<PRE>
public static double <B>getStdDev</B>(java.lang.Number[]&nbsp;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[]&nbsp;xData,
                                    java.lang.Number[]&nbsp;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[]&nbsp;xData,
                              java.lang.Number[]&nbsp;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[]&nbsp;data1,
                                    java.lang.Number[]&nbsp;data2)</PRE>
<DL>
<DD>Calculates the correlation between two datasets.  Both arrays should contain the same number
 of items.  Null values are treated as zero.
 <P>
 Information about the correlation calculation was obtained from:
 
 http://trochim.human.cornell.edu/kb/statcorr.htm
<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.</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[]&nbsp;xData,
                                          java.lang.Number[]&nbsp;yData,
                                          int&nbsp;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>
<HR>

<A NAME="getAverage(java.lang.Number[])"><!-- --></A><H3>
getAverage</H3>
<PRE>
public static double <B>getAverage</B>(java.lang.Number[]&nbsp;data)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>Renamed calculateMean().</I>
<P>
<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>
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