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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Wed Sep 04 10:31:50 CDT 2002 --><TITLE>: Class Statistics</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 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 HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT 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TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | 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">weka.core</FONT><BR>Class Statistics</H2><PRE>java.lang.Object | +--<B>weka.core.Statistics</B></PRE><HR><DL><DT>public class <B>Statistics</B><DT>extends java.lang.Object</DL><P>Class implementing some distributions, tests, etc. Most of the code is adapted from Gary Perlman's unixstat.<P><HR><P><!-- ======== INNER 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="../../weka/core/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="../../weka/core/Statistics.html#binomialStandardError(double, int)">binomialStandardError</A></B>(double p, int n)</CODE><BR> Computes standard error for observed values of a binomial random variable.</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="../../weka/core/Statistics.html#chiSquaredProbability(double, int)">chiSquaredProbability</A></B>(double x, int df)</CODE><BR> Returns chi-squared probability for given value and degrees of freedom.</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="../../weka/core/Statistics.html#FCriticalValue(double, int, int)">FCriticalValue</A></B>(double p, int df1, int df2)</CODE><BR> Critical value for given probability of F-distribution.</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="../../weka/core/Statistics.html#FProbability(double, int, int)">FProbability</A></B>(double F, int df1, int df2)</CODE><BR> Computes probability of F-ratio.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/core/Statistics.html#main(java.lang.String[])">main</A></B>(java.lang.String[] ops)</CODE><BR> Main method for testing this class.</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="../../weka/core/Statistics.html#normalProbability(double)">normalProbability</A></B>(double z)</CODE><BR> Returns probability that the standardized normal variate Z (mean = 0, standard deviation = 1) is less than z.</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="../../weka/core/Statistics.html#studentTConfidenceInterval(int, double, double)">studentTConfidenceInterval</A></B>(int df, double p, double se)</CODE><BR> Computes absolute size of half of a student-t confidence interval for given degrees of freedom, probability, and observed value.</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="binomialStandardError(double, int)"><!-- --></A><H3>binomialStandardError</H3><PRE>public static double <B>binomialStandardError</B>(double p, int n)</PRE><DL><DD>Computes standard error for observed values of a binomial random variable.<DD><DL><DT><B>Parameters:</B><DD><CODE>p</CODE> - the probability of success<DD><CODE>n</CODE> - the size of the sample<DT><B>Returns:</B><DD>the standard error</DL></DD></DL><HR><A NAME="chiSquaredProbability(double, int)"><!-- --></A><H3>chiSquaredProbability</H3><PRE>public static double <B>chiSquaredProbability</B>(double x, int df)</PRE><DL><DD>Returns chi-squared probability for given value and degrees of freedom. (The probability that the chi-squared variate will be greater than x for the given degrees of freedom.) Adapted from unixstat by Gary Perlman.<DD><DL><DT><B>Parameters:</B><DD><CODE>x</CODE> - the value<DD><CODE>df</CODE> - the number of degrees of freedom</DL></DD></DL><HR><A NAME="FCriticalValue(double, int, int)"><!-- --></A><H3>FCriticalValue</H3><PRE>public static double <B>FCriticalValue</B>(double p, int df1, int df2)</PRE><DL><DD>Critical value for given probability of F-distribution. Adapted from unixstat by Gary Perlman.<DD><DL><DT><B>Parameters:</B><DD><CODE>p</CODE> - the probability<DD><CODE>df1</CODE> - the first number of degrees of freedom<DD><CODE>df2</CODE> - the second number of degrees of freedom<DT><B>Returns:</B><DD>the critical value for the given probability</DL></DD></DL><HR><A NAME="FProbability(double, int, int)"><!-- --></A><H3>FProbability</H3><PRE>public static double <B>FProbability</B>(double F, int df1, int df2)</PRE><DL><DD>Computes probability of F-ratio. Adapted from unixstat by Gary Perlman. Collected Algorithms of the CACM Algorithm 322 Egon Dorrer<DD><DL><DT><B>Parameters:</B><DD><CODE>F</CODE> - the F-ratio<DD><CODE>df1</CODE> - the first number of degrees of freedom<DD><CODE>df2</CODE> - the second number of degrees of freedom<DT><B>Returns:</B><DD>the probability of the F-ratio.</DL></DD></DL><HR><A NAME="normalProbability(double)"><!-- --></A><H3>normalProbability</H3><PRE>public static double <B>normalProbability</B>(double z)</PRE><DL><DD>Returns probability that the standardized normal variate Z (mean = 0, standard deviation = 1) is less than z. Adapted from unixstat by Gary Perlman.<DD><DL><DT><B>Parameters:</B><DD><CODE>the</CODE> - z-value<DT><B>Returns:</B><DD>the probability of the z value according to the normal pdf</DL></DD></DL><HR><A NAME="studentTConfidenceInterval(int, double, double)"><!-- --></A><H3>studentTConfidenceInterval</H3><PRE>public static double <B>studentTConfidenceInterval</B>(int df, double p, double se)</PRE><DL><DD>Computes absolute size of half of a student-t confidence interval for given degrees of freedom, probability, and observed value.<DD><DL><DT><B>Parameters:</B><DD><CODE>df</CODE> - the number of degrees of freedom<DD><CODE>p</CODE> - the probability<DD><CODE>se</CODE> - the observed value<DT><B>Returns:</B><DD>absolute size of half of a student-t confidence interval</DL></DD></DL><HR><A NAME="main(java.lang.String[])"><!-- --></A><H3>main</H3><PRE>public static void <B>main</B>(java.lang.String[] ops)</PRE><DL><DD>Main method for testing this class.</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=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../weka/core/SpecialFunctions.html"><B>PREV CLASS</B></A> <A HREF="../../weka/core/Tag.html"><B>NEXT CLASS</B></A></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></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | 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></BODY></HTML>⌨️ 快捷键说明
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