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<html><head><title>polyback</title></head><body bgcolor=white><h1 align=center>Description of the program: <font color=Blue>polyback</font></h1><hr>This program performs a backward elimination for a givenpolynomial. This means it reads the terms of a polynomial from aparameter file (e.g. created by <a href="polypar.html">polypar</a>)and removes term by term down to a given final number of remainingterms. The terms are removed in such a way that the onestep forecasterror is increases minimally.<hr><h2 align=center>Usage:</h2><center><font color=Red>polyback [Options]</font><p>Everything not being a valid option will be interpreted as a potential datafile name. Given no datafile at all, means read stdin. Also <font color=Red>-</font> means stdin<p>Possible options are:<p><table border=2><tr><th>Option<th>Description<th>Default</tr><tr><th>-l#<td>number of data to use<td>whole file</tr><tr><th>-x#<td>number of lines to be ignored<td>0</tr><tr><th>-c#<td><a href=../general.html#column>column to be read</a><td>1</tr><tr><th>-m#<td>embedding dimension<td>2</tr><tr><th>-d#<td>delay<td>1</tr><tr><th>-n#<td>length for the insample error estimation<td>all</tr><tr><th>-s#<td>steps to be forecasted<td>1</tr><tr><th>-##<td>reduce down to # terms<td>1</tr><tr><th>-p#<td>name of the input parameter file<td>parameter.pol</tr><tr><th>-o#<td><a href=../general.html#outfile>output file name</a> (for the forecast errors);<br> without -o data is written to stdout<td>'datafile'.pbe</tr><tr><th>-V#<td><a href=../general.html#verbosity>verbosity level</a><br> 0: only panic messages<br> 1: add input/output messages<td>1</tr><tr><th>-h<td>show these options<td>none</tr></table></center><hr><h2 align=center>Description of the Output:</h2>It creates a lot of new parameter files. For each term removed thereis one file which is called <b>parameter_input_file_name.n</b>, wheren is the number of remaining terms in the polynomial.<br><b>stdout</b> or <b>datafile.pbe</b> contains the followinginformation:<br><b>first column:</b> number of remaining terms in the polynomial<br><b>second column:</b> insample error produced by this polynomial<br><b>third column:</b> out of sample error produced by thispolynomial<br><b>fourth column:</b> the term removed last from the polynomial<br><hr>View the <a href="../../source_c/polyback.c"> C-sources</a>.<hr><a href=../contents.html>Table of Contents</a> * <a href="../../index.html" target="_top">TISEAN home</a></body></html>⌨️ 快捷键说明
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