https://www.cloudcompare.org/doc/wiki/index.php?action=history&feed=atom&title=Scalar_fields%5CCompute_statistical_parametersScalar fields\Compute statistical parameters - Revision history2026-06-15T00:41:28ZRevision history for this page on the wikiMediaWiki 1.44.0https://www.cloudcompare.org/doc/wiki/index.php?title=Scalar_fields%5CCompute_statistical_parameters&diff=46670&oldid=prevDaniel: /* Folded Normal Distribution */2015-02-20T08:14:02Z<p><span class="autocomment">Folded Normal Distribution</span></p>
<p><b>New page</b></p><div>== Menu / Icon ==<br />
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This tool is accessible via the 'Edit > Scalar fields > Compute stat. params' menu or the [[Image:CcComputeStat.png]] icon in the upper main toolbar.<br />
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== Description ==<br />
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Fits a statistical distribution on the active scalar field values.<br />
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CloudCompare will first ask for the type of distribution to fit:<br />
* [http://en.wikipedia.org/wiki/Normal_distribution Gauss (Normal)] distribution<br />
* [http://en.wikipedia.org/wiki/Weibull_distribution Weibull] distribution<br />
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CloudCompare will then fit the chosen distribution and display the result as a curve overlaid on the SF histogram.<br />
[[Image:Cc_sf_stat_params.jpg|frame|center|Edit > Scalar Fields > Compute stat. params output]]<br />
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The numerical parameters of the distribution are also displayed in the [[Console]]. The [http://en.wikipedia.org/wiki/Chi-squared_test Chi-squared] distance is also output so as to give an evaluation of the fitting process quality.<br />
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== ''Folded'' Normal Distribution ==<br />
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Beware that the ''Folded'' Normal distribution is not the same as the Normal distribution.<br />
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For instance, the output of the [[Cloud-to-Cloud_Distance | cloud-to-cloud distance]] computation tool is unsigned (''i.e. no negative values are output, only their absolute values''). In such a case there's absolutely no chance that the resulting distance values follow a Normal Distribution.<br />
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Even if the deformations you are measuring do follow a Normal distribution (''in real life''), then the absolute values will follow a [http://en.wikipedia.org/wiki/Folded_normal_distribution ''Folded Normal Distribution'']. '''Currently CloudCompare can't fit such a distribution on a scalar field'''.</div>Daniel