In this article, we will discuss the Inverse t Distribution Calculator using JavaScript. An inverse t-distribution calculator is a valuable tool for calculating critical values from the t-distribution. It helps researchers and analysts in hypothesis testing, confidence interval estimation, and other statistical calculations.
Using jStat library
- In this approach, we are using jStat library which has built-in functions.
- We are creating a function that takes input of probability and degree of freedom from the form of HTML.
- We are using ‘jStat.studentt.inv’ function for calculating the inverse t distribution.
Example: This example shows the use of the above-explained approach.
HTML
<!DOCTYPE html> < html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
< title >Inverse t-Distribution Calculator</ title >
< script src =
</ script >
</ head >
< body >
< h1 >Inverse t-Distribution Calculator</ h1 >
< form >
< label for = "prob" >Probability (p):</ label >
< input type = "number" id = "prob" step = "0.01" min = "0" max = "1" required>
< br >
< label for = "dof" >Degrees of Freedom (DOF):</ label >
< input type = "number" id = "dof" required>
< br >
< button type = "button" onclick = "inverseT()" >
Calculate
</ button >
</ form >
< div id = "result" ></ div >
< script >
function fun(p, DOF) {
if (p < 0 || p > 1) {
return
"Probability value (p) must be between 0 and 1.";
}
const result = jStat.studentt.inv(p, DOF);
return result;
}
function inverseT() {
const probInput =
document.getElementById("prob");
const DOF =
document.getElementById("dof");
const ans =
document.getElementById("result");
const prob = parseFloat(probInput.value);
const dof = parseInt(DOF.value);
const inverseT = fun(prob, dof);
if (typeof inverseT ===
'number' && !isNaN(inverseT)) {
ans.textContent =
`Inverse t-distribution for p=${prob} and DOF=${dof}: ${inverseT}`;
} else {
ans.textContent = inverseT;
}
}
</ script >
</ body >
</ html >
|
CSS
body { font-family : Arial , sans-serif ;
text-align : center ;
} h 1 {
color : #333 ;
} form { margin : 20px auto ;
padding : 20px ;
border : 1px solid #ccc ;
width : 300px ;
background-color : #f7f7f7 ;
} label { display : block ;
margin-bottom : 10px ;
} input[type= "number" ] {
width : 100% ;
padding : 5px ;
margin-bottom : 10px ;
} button { background-color : #4CAF50 ;
color : white ;
border : none ;
padding : 10px 20px ;
cursor : pointer ;
} button:hover { background-color : #45a049 ;
} #result { margin-top : 20px ;
font-weight : bold ;
padding : 10px ;
border : 1px solid #ccc ;
background-color : #f0f0f0 ;
color : #4CAF50 ;
} |
Output: