Simulate raid healing attendance

gistfile1.js

var fs = require('fs'),
	input = {
		nifty: 91,
		shaggus: 92,
		svansemanden: 100,
		plencis: 90,
		turnunder: 75,
		moui: 79,
		mayoto: 85,
		galacta: 77,
		shalelol: 95,
		ozma: 74
	}, output = [], i;

function simulateRaid () {
	var output = {
			numAttending: 0,
			data: []
		}, 
		name, attendance,
		chance, willAttend;
	
	for (name in input) {
		attendance = input[name];
		chance = Math.ceil(Math.random() * 100);
		willAttend = !(chance > attendance);
	
		output.data.push({
			name: name,
			attending: willAttend
		});
		
		willAttend && output.numAttending++;
	}
	
	return output;
}

function getStats (data) {
	var total = 0, min, max, i = 0,
		num;
	
	for (; i < data.length; i++) {
		num = data[i].numAttending;
		
		total += num;
		
		if (!max && !min) {
			max = min = num;
		} else {
			max = Math.max(num, max);
			min = Math.min(num, min);
		}
	}
	
	return {
		avrage: Math.floor( total / data.length ),
		min: min,
		max: max
	};
}

function formatOutput (data) {
	var output = "", i = 0, row;
	
	output += "Raid;Num Attending\n";
	
	for (; i < data.length; i++) {
		row = data[i];
		
		output += "Raid " + i + ";" + row.numAttending + "\n";
	}
	
	output += " ; \n";
	output += "Min raiders;" + data.stats.min + "\n";
	output += "Max raiders;" + data.stats.max + "\n";
	output += "Total avrage;" + data.stats.avrage;
	
	return output;
}

for (i = 0; i < 100; i++) {
	output.push( simulateRaid() );
}

output.stats = getStats(output);

fs.open('./output.csv', 'w+', '0666', function (err, fd) {	
	fs.writeSync(fd, formatOutput(output), 0);
});