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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Sampling Tool</title>
<style>
form {
display: table;
}
form div {
display: table-row;
}
label, input {
display: table-cell;
margin-bottom: 10px;
}
label {
padding-right: 10px;
}
table {
width: 100%;
border-collapse: collapse;
margin-top: 10px;
}
table, th, td {
border: 1px solid black;
}
th, td {
padding: 5px;
text-align: center;
}
</style>
</head>
<body>
<h1>Sampling Tool</h1>
<p>This sampling tool provides a quick and easy way to generate
psuedo-random samples within a defined range. Simply enter the size of your
population, enter your desired number of samples, and generate!</p>
<p>To reproduce and validate a previously-generated sample, please ensure
you have entered the seed value correctly when submitting the form. All
inputs must match the previously-generated sample's inputs to generate the
same output.</p>
<form id="sampleForm" onsubmit="return handleFormSubmit(event)">
<div>
<label for="populationSize">Population Size*:</label>
<input type="number" id="populationSize" name="populationSize" min="1" autofocus required>
</div>
<div>
<label for="sampleSize">Sample Size*:</label>
<input type="number" id="sampleSize" name="sampleSize" min="1" required>
</div>
<div>
<label for="replacementSize">Replacement Sample Size:</label>
<input type="number" id="replacementSize" name="replacementSize" min="0">
</div>
<div>
<label for="customSeed">Custom Seed (optional):</label>
<input type="number" id="customSeed" name="customSeed" min="0">
</div>
<div>
<input type="submit" value="Calculate">
</div>
<p><i>* Indicates a required field</i></p>
</form>
<hr>
<div id="results"></div>
<script>
function seededRandom(seed) {
let s = seed % 2147483647;
return function() {
s = (s * 16807) % 2147483647;
return (s - 1) / 2147483646;
};
}
function handleFormSubmit(event) {
event.preventDefault(); // Prevent the default form submission behavior
const customSeedInput = document.getElementById('customSeed').value;
const seed = customSeedInput ? parseInt(customSeedInput) : Math.floor(Math.random() * 1000000); // Use custom seed if provided
generateSamples(seed); // Call the function with the seed
}
function generateSamples(seed) {
const populationSize = parseInt(document.getElementById('populationSize').value);
const sampleSize = parseInt(document.getElementById('sampleSize').value);
const replacementSize = parseInt(document.getElementById('replacementSize').value || 0);
const resultsDiv = document.getElementById('results');
// Clear previous results
resultsDiv.innerHTML = '';
// Validate inputs
if (isNaN(populationSize) || isNaN(sampleSize) || populationSize <= 0 || sampleSize <= 0) {
alert("Please enter valid numbers for required fields.");
return;
}
if (sampleSize + replacementSize > populationSize) {
alert("Not enough unique samples available. Reduce the sample size or replacement size.");
return;
}
// Create seeded random function
const random = seededRandom(seed);
// Generate an array of population numbers
const population = Array.from({ length: populationSize }, (_, i) => i + 1);
// Shuffle the population array using the seeded random function
const shuffledPopulation = population
.map(value => ({ value, sort: random() }))
.sort((a, b) => a.sort - b.sort)
.map(({ value }) => value);
// Select original samples
const originalSamples = shuffledPopulation.slice(0, sampleSize);
// Select replacement samples
const replacementSamples = shuffledPopulation.slice(sampleSize, sampleSize + replacementSize);
// Display the seed
const seedInfo = document.createElement('p');
seedInfo.textContent = `Seed: ${seed}`;
resultsDiv.appendChild(seedInfo);
// Generate tables
const originalTable = createTable(originalSamples, "Original Samples");
const replacementTable = createTable(replacementSamples, "Replacement Samples");
// Append tables to the results div
resultsDiv.appendChild(originalTable);
if (replacementSamples.length > 0) {
resultsDiv.appendChild(replacementTable);
}
}
function createTable(dataArray, tableTitle) {
const table = document.createElement('table');
const caption = document.createElement('caption');
caption.textContent = tableTitle;
table.appendChild(caption);
const headerRow = document.createElement('tr');
const indexHeader = document.createElement('th');
indexHeader.textContent = 'Index';
const sampleHeader = document.createElement('th');
sampleHeader.textContent = 'Sample';
headerRow.appendChild(indexHeader);
headerRow.appendChild(sampleHeader);
table.appendChild(headerRow);
dataArray.forEach((sample, index) => {
const row = document.createElement('tr');
const indexCell = document.createElement('td');
const sampleCell = document.createElement('td');
indexCell.textContent = index + 1;
sampleCell.textContent = sample;
row.appendChild(indexCell);
row.appendChild(sampleCell);
table.appendChild(row);
});
return table;
}
</script>
</body>
</html>
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