advanced code snippet search

Posted By

jatkins on 05/10/10


Tagged

math Maths standarddeviation


Versions (?)

Standard Deviation Calculator

 / Published in: HTML
 

Licensed under CC-by-2.0.

Expand | Embed | Plain Text 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  2. <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
  3. <head>
  4. 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  5. 	<title>Standard deviation calculator</title>
  6. 	<style type="text/css">
  7. 	<!--
  8. 	body {
  9. 		font: 80% Arial, Helvetica, sans-serif;
  10. 	}
  11.  
  12. 	span {
  13. 		display: block;
  14. 	}
  15. 	-->
  16. 	</style>
  17. 	<script type="text/javascript">
  18. 	<!--
  19. 	var i = 0, fieldCount = 0, mean = 0, deviation = 0;
  20.  
  21. 	function get(elmnt) {
  22. 		return document.getElementById(elmnt);
  23. 	}
  24.  
  25. 	function add_field() {
  26. 		newFieldSpan = document.createElement('span');
  27. 		newFieldSpan.id = 'spanField'+fieldCount.toString();
  28. 		newField = document.createElement('input');
  29. 		newField.type = 'text';
  30. 		newField.value = '';
  31. 		newField.id = 'txtValue'+fieldCount;
  32. 		newFieldSpan.appendChild(newField);
  33. 		deleteButton = document.createElement('input');
  34. 		deleteButton.type = 'button';
  35. 		deleteButton.value = 'Delete'
  36. 		deleteButton.title = 'spanField'+fieldCount.toString();
  37. 		deleteButton.onclick = function() { get('divFields').removeChild(get(this.title.toString())); fieldCount--; };
  38. 		newFieldSpan.appendChild(newField);
  39. 		newFieldSpan.appendChild(deleteButton);
  40. 		get('divFields').appendChild(newFieldSpan);
  41. 		fieldCount++;
  42. 	}
  43.  
  44. 	function calculate() {
  45. 		mean = 0;
  46. 		deviation = 0;
  47. 		for(i=0;i<fieldCount;i++) {
  48. 			mean += parseFloat(get('divFields').childNodes[i].childNodes[0].value);
  49. 		}
  50. 		mean /= fieldCount;
  51. 		for(i=0;i<fieldCount;i++) {
  52. 			deviation += Math.pow(parseFloat(get('divFields').childNodes[i].childNodes[0].value) - mean, 2);
  53. 		}
  54. 		deviation = Math.sqrt(deviation/(fieldCount-1));
  55. 		get('divResults').innerHTML = '<h2>Standard Deviation: '+deviation.toString()+'</h2>';
  56. 	}
  57. 	-->
  58. 	</script>
  59. </head>
  60. <body>
  61. 	<div>
  62. 		<h1>Standard deviation calculator</h1>
  63. 		<input type="button" value="Add Field" onclick="add_field();" />
  64. 		<div id="divFields"></div>		
  65. 		<input type="submit" value="Calculate" onclick="calculate();" />
  66. 	</div>
  67. 	<div id="divResults">
  68. 	</div>
  69. </body>
  70. </html>

Report this snippet  

Comments

RSS Icon Subscribe to comments
Posted By: geeknick1 on November 4, 2011

Steps for Standard Deviation Step 1 : Use formula for standard deviation, σ = √[(1/N)Σi(xi-μ)2].

Step 2 : Where σ - the standard deviation N - number of data points ; xi - the random variable where i takes values from 1 to N ;

Step 3 : μ- the mean of the data set; Then write the final answer for σ .

if you any large problem then i will suggest to use Standard Deviation Calculator Online

Posted By: geeknick1 on November 4, 2011

Steps for Standard Deviation Step 1 : Use formula for standard deviation, σ = √[(1/N)Σi(xi-μ)2].

Step 2 : Where σ - the standard deviation N - number of data points ; xi - the random variable where i takes values from 1 to N ;

Step 3 : μ- the mean of the data set; Then write the final answer for σ .

if you any large problem then i will suggest to use Standard Deviation Calculator Online

You need to login to post a comment.