<html lang="en"> <head> <title>Statistics - GNU Octave</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="GNU Octave"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="prev" href="Optimization.html#Optimization" title="Optimization"> <link rel="next" href="Sets.html#Sets" title="Sets"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Statistics"></a> <p> Next: <a rel="next" accesskey="n" href="Sets.html#Sets">Sets</a>, Previous: <a rel="previous" accesskey="p" href="Optimization.html#Optimization">Optimization</a>, Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> <hr> </div> <h2 class="chapter">26 Statistics</h2> <p>Octave has support for various statistical methods. This includes basic descriptive statistics, probability distributions, statistical tests, random number generation, and much more. <p>The functions that analyze data all assume that multi-dimensional data is arranged in a matrix where each row is an observation, and each column is a variable. Thus, the matrix defined by <pre class="example"> a = [ 0.9, 0.7; 0.1, 0.1; 0.5, 0.4 ]; </pre> <p class="noindent">contains three observations from a two-dimensional distribution. While this is the default data arrangement, most functions support different arrangements. <p>It should be noted that the statistics functions don't test for data containing NaN, NA, or Inf. These values need to be detected and dealt with explicitly. See <a href="doc_002disnan.html#doc_002disnan">isnan</a>, <a href="doc_002disna.html#doc_002disna">isna</a>, <a href="doc_002disinf.html#doc_002disinf">isinf</a>, <a href="doc_002disfinite.html#doc_002disfinite">isfinite</a>. <ul class="menu"> <li><a accesskey="1" href="Descriptive-Statistics.html#Descriptive-Statistics">Descriptive Statistics</a> <li><a accesskey="2" href="Basic-Statistical-Functions.html#Basic-Statistical-Functions">Basic Statistical Functions</a> <li><a accesskey="3" href="Statistical-Plots.html#Statistical-Plots">Statistical Plots</a> <li><a accesskey="4" href="Correlation-and-Regression-Analysis.html#Correlation-and-Regression-Analysis">Correlation and Regression Analysis</a> <li><a accesskey="5" href="Distributions.html#Distributions">Distributions</a> <li><a accesskey="6" href="Tests.html#Tests">Tests</a> <li><a accesskey="7" href="Random-Number-Generation.html#Random-Number-Generation">Random Number Generation</a> </ul> </body></html>