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standard-deviation.html
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---
title: Calculate Standard Deviation | Standard Deviation Online | Math Tools
layout: post
---
<html>
<head>
{% include common-meta %}
<title>{{ page.title }}</title>
<!-- Tell the browser to be responsive to screen width -->
<meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
<meta name="description"
content="This is open source tool to calculate standard deviation, and related statistics online" />
<meta name="keywords" content="online,tool,math,standard,deviation,statistics,sigma,web,opensource,http" />
<!-- CSS for the site theme -->
{% include theme-css %}
<!-- Annoying IE fixes -->
{% include ie-fixes %}
</head>
<body class="hold-transition skin-green sidebar-mini">
<!-- Site wrapper -->
<div class="wrapper">
<!-- header tag from theme -->
{% include theme-header %}
<!-- Sidebar for the whole website -->
{% include theme-sidebar %}
<!-- Content Wrapper. Contains page content -->
<div class="content-wrapper">
<!-- Main content -->
<section class="content">
<div class="box box-info">
<div class="box-header with-border">
<h1 class="box-title">Calculate Standard Deviation Online Tool</h1>
</div>
<!-- /.box-header -->
<!-- form start -->
<div class="box-body">
<form role="form">
<div class="form-group">
<textarea class="form-control" rows="20"
placeholder="Copy/Paste list of numbers here to see standard deviation"
id="inputText" autofocus></textarea>
</div>
</form>
</div>
<div class="box-footer">
<div id="result">
<div><code>Standard Deviation[σ]: ?</code></div>
</div>
<div id="count">
<div><code>Data Count[Valid Number Input]: ?</code></div>
</div>
<div id="separator">
<div><code>Data Separator: Automatic</code></div>
</div>
</section>
<section class="content">
<div class="box box-info">
<div class="box-header with-border">
<h3 class="box-title">About Standard Deviation Calculator Tool</h3>
</div>
<!-- /.box-header -->
<div class="box-body">
<img class="img-responsive" src="images/standard-deviation.png"
alt="Online Standard Deviation Calculator Tool"
title="Online Standard Deviation Calculator Tool" />
<p>This is a free online tool to do calculation of standard deviation statistics function.</p>
</div>
<!-- /.box-body -->
</div>
<div class="box box-info">
<div class="box-header with-border">
<h3 class="box-title">Why Standard Deviation Calculation Is Needed?</h3>
</div>
<!-- /.box-header -->
<div class="box-body">
<p>Standard deviation is a common way to measure variation or dispersion of data. This is a
common tool to do statistical analysis of large data set.</p>
</div>
<!-- /.box-body -->
</div>
<div class="box box-info">
<div class="box-header with-border">
<h3 class="box-title">What Standard Deviation Formula is used this tool?</h3>
</div>
<!-- /.box-header -->
<div class="box-body">
<p>This tool uses mean to calculate the variation.</p>
<img class="img-responsive" src="images/standard-deviation-formula.png"
alt="Online Standard Deviation Calculator Tool Uses This Formula"
title="Online Standard Deviation Calculator Tool Uses This Formula" />
</div>
<!-- /.box-body -->
</div>
<div class="box box-info">
<div class="box-header with-border">
<h3 class="box-title">What separator to use in the data in this tool?</h3>
</div>
<!-- /.box-header -->
<div class="box-body">
<p>This tool tries to automatically guess from the list of common separators that include
following. In case data has multiple separator it will use following order </p>
</div>
<div> <code>Newline: '\n'</code></div>
<div> <code>Comma: ','</code></div>
<div> <code>Colon: ':'</code></div>
<div> <code>Semicolon: ';'</code></div>
<div> <code>Tab: '\t'</code></div>
<div> <code>PIpe: '|'</code></div>
</div>
<!-- /.box-body -->
</div>
<!-- /.box -->
</section>
{% include addthis %}
</div>
<!-- /.content-wrapper -->
{% include theme-footer %}
</div>
<!-- ./wrapper -->
{% include theme-bottom-js %}
</body>
<script src="plugins/selectOnFocus/jquery.selectOnFocus.min.js"></script>
<script src="javascripts/fromdev-utils.js"></script>
<script>
const textarea = document.getElementById("inputText");
const result = document.getElementById("result");
const separatorElement = document.getElementById("separator");
const countElement = document.getElementById("count");
textarea.addEventListener("input", function () {
const inVal = this.value || '';
const separator = TextUtils.guessSeparator(inVal);
const values = inVal.split(separator.value);
const numValues = values.map(Number.parseFloat).filter(Number);
const count = (numValues) ? numValues.length : 0;
const v = MathUtils.standardDeviation(numValues);
const displayValue = (Number.isNaN(v)) ? '?' : (v || '?');
result.innerHTML = `<div><code>Standard Deviation[σ]: ${displayValue} </code></div>`;
const separatorHtml = `<div><code>Data Separator: ${separator.name} ['${separator.displayValue || separator.value}'] </code></div>`;
separatorElement.innerHTML = separatorHtml;
countElement.innerHTML = `<div><code>Data Count[Valid Number Input]: ${count}</code></div>`;
}, false);
$(document).ready(function () {
$('#string-utility-category').addClass('active');
$('.markdown-body').attr('style', 'max-width:100%;');
});
</script>
</html>