JavaScript Program for Chi-Square Critical Value Calculator
Last Updated :
28 Sep, 2023
In this article, we will discuss the Chi-Square Critical Value Calculator. The Chi-Square Critical Value Calculator is a JavaScript tool used to determine critical values from the chi-square distribution. Chi-Square critical values help you decide if your study results are strong enough to conclude that there’s a real difference or if it might just be due to random luck.
These are the following approaches by using these you can calculate the chi-square critical value:
Using jStat library
- In this approach, we are using jStat to solve this problem.
- The ‘getCriticalValue’ function has a predefined value for the degree of freedom and significance level
- The result is printed in the console.
To run this code you have to install jSate library:
npm install jState
To run this code in your code editor:
node your_file_name
Example: This example shows the use of the above-explained approach.
Javascript
function getCriticalValue(DOF, SL) {
const criticalValue =
jStat.chisquare.inv(1 - SL, DOF).toFixed(4);
console.log(`Chi-Square Critical Value: ${criticalValue}`);
}
const DOF = 4;
const SL = 0.05;
getCriticalValue();
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Output:
Chi-Square Critical Value: 9.4877
Using a Predefined Table
- In this approach we are creating a custom table for chi-square critical values.
- We are creating a function ‘getCriticalValue’ for calculation of critical value.
- We are using predefined values for looking the chi square critical value based on input DOF and SL.
Example: This example shows the use of the above-explained approach.
Javascript
const chiSquareCriticalValues = {
1: { 0.01: 6.63, 0.05: 3.84, 0.10: 2.71 },
2: { 0.01: 9.21, 0.05: 5.99, 0.10: 4.61 },
};
function getCriticalValue(DOF, SL) {
const criticalValue =
chiSquareCriticalValues[DOF][SL];
return criticalValue;
}
const DOF = 2;
const SL = 0.05;
const criticalValue = getCriticalValue(DOF, SL);
console.log(`Chi-Square Critical Value: ${criticalValue}`);
|
Output:
Chi-Square Critical Value: 5.99
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