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Sample Size Calculator
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| // Adapted from CRS: http://www.surveysystem.com/sscalc.htm | |
| conInt = 0; | |
| conLev=1; | |
| zVal=1.96; | |
| zValC=3.8416; | |
| ss=0; | |
| pop=0; | |
| perc=0; | |
| pf = 0; | |
| function to(obj) { | |
| if (obj.box.value == "") { | |
| conInt=0 | |
| } | |
| else { | |
| conInt = eval(obj.box.value) | |
| } | |
| if (obj.popbox.value == "") { | |
| pop=0 | |
| } | |
| else { | |
| pop = eval(obj.popbox.value) | |
| } | |
| if (conInt == 0) { | |
| alert("You must enter a confidence interval between .1 and 50.") | |
| } | |
| else { | |
| if (pop == 0) { | |
| ss = ((zVal *zVal) * 0.25) / ((conInt / 100) *(conInt / 100)) | |
| } | |
| else { | |
| ss = ((zVal *zVal) * 0.25) / ((conInt / 100) *(conInt / 100)); | |
| ss=ss/(1+(ss-1)/pop) | |
| } | |
| obj.ssbox.value=parseInt(ss+.5) | |
| } | |
| } | |
| function ConLevButF1(obj){ | |
| zVal=1.96 | |
| } | |
| function ConLevButF2(obj){ | |
| zVal=2.58 | |
| } | |
| function ConLevButFC1(obj){ | |
| zValC=3.8416 ; | |
| } | |
| function ConLevButFC2(obj){ | |
| zValC=6.6564 ; | |
| } | |
| function cler(obj, string) { | |
| obj.box.value = string; | |
| obj.popbox.value = string; | |
| obj.ssbox.value = string; | |
| } |
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| <html> | |
| <head> | |
| <title>Sample Size Calculator</title> | |
| <link href="//maxcdn.bootstrapcdn.com/bootswatch/3.3.0/paper/bootstrap.min.css" rel="stylesheet"> | |
| <script src="confidence.js"></script> | |
| </head> | |
| <body> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> | |
| <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script> | |
| <div class="container"> | |
| <h1>Sample Size Calculator</h1> | |
| <form id="calc" name="calc"> | |
| <table class="table"> | |
| <tr> | |
| <td>Confidence Level:</td> | |
| <td> | |
| <label class="radio-inline"><input checked name="ConLevBut" onclick="ConLevButF1(this.form)" type="radio" value="1"> 95%</label> | |
| <label class="radio-inline"><input name="ConLevBut" onclick="ConLevButF2(this.form)" type="radio" value="2"> 99%</label> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td>Margin of Error:</td> | |
| <td><input name="box" type="text"></td> | |
| </tr> | |
| <tr> | |
| <td>Population:</td> | |
| <td><input name="popbox" onkeyup="this.value=iVal(this.value)" type= | |
| "text"></td> | |
| </tr> | |
| <tr> | |
| <td><input class="btn btn-primary" name="Calculate" onclick="to(this.form)" type="button" value="Calculate"></td> | |
| <td><input class="btn btn-default" name="Clear" onclick="cler(this.form,'')" type="button" value=" Clear "></td> | |
| </tr> | |
| <tr> | |
| <td>Sample size needed:</td> | |
| <td><input name="ssbox" type="text"></td> | |
| </tr> | |
| </table> | |
| </form> | |
| </div> | |
| </body> | |
| </html> |
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