The Crude Birth Rate (CBR) is a fundamental demographic indicator used to measure the number of live births in a population over a specific period, usually a year, relative to the total population size. It provides a snapshot of the fertility levels of a population and is a key component in understanding population growth and change.
function calculateCBR() {
var liveBirths = document.getElementById("liveBirths").value;
var midYearPopulation = document.getElementById("midYearPopulation").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
// Input validation
if (isNaN(liveBirths) || liveBirths === "" || isNaN(midYearPopulation) || midYearPopulation === "") {
resultDiv.innerHTML = "Please enter valid numbers for both fields.";
return;
}
if (parseFloat(liveBirths) < 0 || parseFloat(midYearPopulation) <= 0) {
resultDiv.innerHTML = "Number of live births cannot be negative, and mid-year population must be a positive number.";
return;
}
// Calculation
var cbr = (parseFloat(liveBirths) / parseFloat(midYearPopulation)) * 1000;
// Display result
resultDiv.innerHTML = "