1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889 |
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
- "http://www.w3.org/TR/REC-html40/loose.dtd">
- <html>
- <head>
- <title>Description of lfex2</title>
- <meta name="keywords" content="lfex2">
- <meta name="description" content="Model the success probability of successive trials of a monkey">
- <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- <meta name="generator" content="m2html © 2005 Guillaume Flandin">
- <meta name="robots" content="index, follow">
- <link type="text/css" rel="stylesheet" href="../../../m2html.css">
- <script type="text/javascript">
- if (top.frames.length == 0) { top.location = "../../../index.html"; };
- </script>
- </head>
- <body>
- <a name="_top"></a>
- <!-- ../../menu.html chronux_2_10 --><!-- # locfit --><!-- menu.html Neuro -->
- <h1>lfex2
- </h1>
- <h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
- <div class="box"><strong>Model the success probability of successive trials of a monkey</strong></div>
- <h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
- <div class="box"><strong>This is a script file. </strong></div>
- <h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
- <div class="fragment"><pre class="comment"> Model the success probability of successive trials of a monkey
- performing a task.
- The 'y' variable is a vector of 0/1, with 1 denoting success on
- the trial; 0 failure. The fitting procedure uses logistic
- regression within sliding windows (specified by the 'family','binomial'
- arguments).
- Choosing the bandwidth here is critical. The data shows `on/off' behavior,
- exhibiting periods of mainly successes, and mainly failures, respectively.
- Large values of alpha will smooth out this behavior, while small values
- will be too sensitive to random variability. Values of 0.15 to 0.2 seem
- reasonable for this example.
- AIC is based on asymptotic approximations, and seems unreliable here --
- formal model selection needs more investigation.
- Data is from Keith Purpura.</pre></div>
- <!-- crossreference -->
- <h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
- This function calls:
- <ul style="list-style-image:url(../../../matlabicon.gif)">
- <li><a href="../../../chronux_2_10/locfit/m/lfband.html" class="code" title="function lfband(fit,varargin)">lfband</a> adds confidence bands around the plot of a locfit() fit.</li><li><a href="../../../chronux_2_10/locfit/m/lfplot.html" class="code" title="function lfplot(varargin)">lfplot</a> Plot (for one or two dimensions) a locfit() fit.</li><li><a href="../../../chronux_2_10/locfit/m/locfit.html" class="code" title="function fit=locfit(varargin)">locfit</a> Smoothing noisy data using Local Regression and Likelihood.</li></ul>
- This function is called by:
- <ul style="list-style-image:url(../../../matlabicon.gif)">
- </ul>
- <!-- crossreference -->
- <h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
- <div class="fragment"><pre>0001 <span class="comment">% Model the success probability of successive trials of a monkey</span>
- 0002 <span class="comment">% performing a task.</span>
- 0003 <span class="comment">%</span>
- 0004 <span class="comment">% The 'y' variable is a vector of 0/1, with 1 denoting success on</span>
- 0005 <span class="comment">% the trial; 0 failure. The fitting procedure uses logistic</span>
- 0006 <span class="comment">% regression within sliding windows (specified by the 'family','binomial'</span>
- 0007 <span class="comment">% arguments).</span>
- 0008 <span class="comment">%</span>
- 0009 <span class="comment">% Choosing the bandwidth here is critical. The data shows `on/off' behavior,</span>
- 0010 <span class="comment">% exhibiting periods of mainly successes, and mainly failures, respectively.</span>
- 0011 <span class="comment">% Large values of alpha will smooth out this behavior, while small values</span>
- 0012 <span class="comment">% will be too sensitive to random variability. Values of 0.15 to 0.2 seem</span>
- 0013 <span class="comment">% reasonable for this example.</span>
- 0014 <span class="comment">%</span>
- 0015 <span class="comment">% AIC is based on asymptotic approximations, and seems unreliable here --</span>
- 0016 <span class="comment">% formal model selection needs more investigation.</span>
- 0017 <span class="comment">%</span>
- 0018 <span class="comment">% Data is from Keith Purpura.</span>
- 0019
- 0020 load 050527_correct.mat;
- 0021 y = byTrial(1).correct';
- 0022 n = length(y);
- 0023 fit = <a href="../../../chronux_2_10/locfit/m/locfit.html" class="code" title="function fit=locfit(varargin)">locfit</a>((1:n)',y,<span class="string">'family'</span>,<span class="string">'binomial'</span>,<span class="string">'alpha'</span>,0.15);
- 0024 <a href="../../../chronux_2_10/locfit/m/lfplot.html" class="code" title="function lfplot(varargin)">lfplot</a>(fit);
- 0025 title(<span class="string">'Local Logistic Regression - Estimating Success Probability'</span>);
- 0026 <a href="../../../chronux_2_10/locfit/m/lfband.html" class="code" title="function lfband(fit,varargin)">lfband</a>(fit);</pre></div>
- <hr><address>Generated on Fri 12-Aug-2011 11:36:15 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/" target="_parent">m2html</a></strong> © 2005</address>
- </body>
- </html>
|