Binomial Distribution Calculator

Binomial distribution calculator, allows you to calculate binomial probabilities without using lengthy equations.

Features

Use this calculator to compute the probability of number of successes in number of events.
Binomial distribution is completely defined by two parameters which is n and p.
Probability of success must be between 0 and 1.
Online Javascript calculator, helps to estimate the binomial distribution in few seconds.
Simple, flexible and responsive calculator.

Preview

Binomial Distribution - Calculator

Downloads

Code

<html>
<head>

<title>Binomial Distribution Calculator in Javascript </title>
<script type="text/javascript">
function chk(){
var sds = document.getElementById('dum');
if(sds == null){alert("You are using a free package.\n You are not allowed to remove the tag.\n");

document.getElementById("maindiv").style.visibility="hidden";
}
var sdss = document.getElementById("dumdiv");
if(sdss == null){alert("You are using a free package.\n You are not allowed to remove the tag.\n");}
}

window.onload=chk;
function allnumeric(inputtxt)
{var numbers = /^[0-9]+$/; if(!inputtxt.value.match(numbers)) {
inputtxt.value = ''; }
}
function check(ad)
{
var ch=ad.value;
if(isNaN(ch))
{
var df=ch.substring(0,(ch.length-1));ad.value=df;}
}
function ck()
{alert("this");
}
function minmax(value)

{if(parseInt(value) > 150){alert("Enter number of events below 150");
document.getElementById("n").value='';
}}
function bin()
{var a = document.getElementById("n").value;
var b = document.getElementById("r").value;
var c = document.getElementById("p").value;
if(a == ""){alert("Enter the number of events");}
else if(b == ""){alert("Enter the number of success");}
else if(c == ""){alert("Enter the Probability of success");}

else{a=parseFloat(a);b=parseFloat(b);c=parseFloat(c);if(c>1){alert("The probability of success must be between 0 and 1");}else if(b>a){alert("Number of success r should be less than number of events n");}else{

//n!
var z=1;for(var i=a; i>=1; i--){z=z*i;}//r!
var x=1;for(var k=b;k>=1;k--){x=x*k;}

//(n-r)!
var s=a-b;var t=1;for(var j=s;j>=1;j--){t=t*j;}//PERMUTATION [ n!/(n-r)! ]
var p=z/t;
//COMBINATION [ (n!/(n-r)!) / r! ] , nCr = y ; 1-p = d ; n-r = e ; p^r=f
var y=p/x;var d=1-c;var e=a-b;var f=Math.pow(c,b);var g=Math.pow(d,e);
//BINOMIAL DISTRIBUTION
var res=y*f*g;if(res=="Infinity"){res = 0;}res=res.toFixed(7);

document.getElementById("b").value = res;}}

}
</script>
<style>h2 {border-bottom: 1px solid #ebebeb;color: #474747;font-size: 1.3em;font-weight: normal;line-height: 130%;}.frms{margin:0 auto;padding:10px;-moz-border-radius:.3em;-webkit-border-radius:.3em;-o-border-radius:.3em;font-family:Tahoma, Geneva, sans-serif;color:#333;font-size:.9em;line-height:1.2em;}.frms input[type="text"],[type="password"],[type="file"],textarea,select{width:99%;background:#fff;border:#ddd 1px solid;border-radius:.35em;-moz-border-radius:.35em;-webkit-border-radius:.35em;-o-border-radius:.35em;padding:0 .5%;margin-top:5px;margin-bottom:15px;height:35px;}.frms input:hover,textarea:hover,select:hover{box-shadow:#dae1e5 0px 0px 5px;-moz-box-shadow:#dae1e5 0px 0px 5px;-webkit-box-shadow:#dae1e5 0px 0px 5px;-o-box-shadow:#dae1e5 0px 0px 5px;}.frms input:focus,textarea:focus,select:focus{-webkit-box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);-moz-box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);border:#9d9983 1px solid;}.frms input[type="submit"],input[type="reset"],input[type="button"],button,.yellow_button,.blue_button{padding:7px 14px;font-weight:bold;color:#fff;cursor:pointer;border-radius:.3em;-moz-border-radius:.2em;-webkit-border-radius:.2em;-o-border-radius:.2em;margin:10px 0;border:none;}.frms input[type="submit"]{background:#75ab22;border-bottom:#629826 3px solid;text-shadow:#396e12 1px 1px 0px;}.frms input[type="reset"]{background:#ee765d;border-bottom:#d95e44 3px solid;text-shadow:#8c3736 1px 1px 0px;}input[type="button"],button,.blue_button{background:#468cd2;border-bottom:#3277bc 3px solid;text-shadow:#214d73 1px 1px 0px;}.frms label{font-size:1.2em;}.resp_code{margin:5px 10px 10px 300px;padding:10px 20px 10px 20px;font:normal 1em/1.3em Tahoma, Geneva, sans-serif;color:#333;background:#f8f8f8;border:#ddd 1px solid;border-radius:.25em;overflow:auto;width:50%;}@media screen and (max-width: 480px){.resp_code{width:auto !important;margin:0px !important;}.frms label{font-size:0.9em;}}
</style>
</head>
<body><div class='resp_code' id=maindiv'><div align='center'><h2>Binomial Distribution - Calculator</h2></div>
<form name=first class='frms'><div align='left'><label>Enter the number of events n:</label><input type=text id=n onkeyup="minmax(this.value),allnumeric(this)" maxlength=3></div><div align='left'><label>Enter the number of success r:</label><input type=text id=r onkeyup="allnumeric(this)" maxlength=3>
</div><div align='left'><label>Enter the Probability of success p:</label>
<input type=text id=p onkeyup=check(this) maxlength=3></div><div align=center><input type=button value=Calculate onclick='bin()'>
<input type=reset value=Reset> <span align=''center'' style="font-size: 10px;color: #dadada;" id="dumdiv"><a href="https://www.hscripts.com" id="dum" style="font-size: 10px;color: #dadada;text-decoration:none;color: #dadada;">©h</a></span></div><div align='left'><label>Binomial Distribution:</label><input type=text id=b readonly></div>
</form></div>
</body>
</html>

Release Date - 02-04-2015
Get free version without ©copyright link for just $10/-
For customization of this script or any script development, mail to support@hscripts.com

Usage

Copy and paste the above code into your HTML page.
Run the file in your browser.
Enter the number of events, number of success and probability of success.
Click calculate and you will get the binomial distribution of the problem.
If you want the functionality of this script alone, copy the code from the <script> tag and paste it in head part of HTML page where you need.