AB Test

const crypto = require('crypto'); function generateABValue(userId, featureName, ratio) { if (ratio > 1 || ratio < 0) { throw new Error("Ratio must be between 0 and 1"); } if(ratio === 0) return 'A'; if(ratio === 1) return 'B'; // Create a hash from the userId, featureName const hash = crypto.createHash('sha1'); hash.update(userId + featureName); const hashedValue = hash.digest('hex'); // Convert the last 2 characters of the hash into an integer and normalize to 0-1 range const intValue = parseInt(hashedValue.slice(-2), 16); const normalizedValue = intValue / 255; //console.log({hashedValue, intValue, normalizedValue}) // Use the ratio to determine the group return normalizedValue <= ratio ? 'B' : 'A'; } function testDistribution(ratio, featureName) { var countA = 0; var countB = 0; // Run the function 10000 times with different userIds for (var i = 0; i < 10000; i++) { var group = generateABValue('user' + i, featureName, ratio); if (group === 'A') { countA++; } else if (group === 'B') { countB++; } } console.log('Group A: ' + countA); console.log('Group B: ' + countB); // console.log('Group: ' + generateABValue(62432877, featureName, ratio)); } testDistribution(0.5, "ab_test_bnpl_ph") // console.log('Groups: ' + generateABValue("62432877", "ab_test_fps", 0.5));