Brendan Sudol brendansudol

Efficient Market Hypothesis, from Economics

When it comes to investing, many economists believe that a blindfolded monkey throwing darts at a newspaper’s financial pages could select a portfolio of stocks that would do just as well as Wall Street professionals. The idea that picking good stocks is just a matter of luck comes from a fundamental theory in financial economics known as the Efficient Market Hypothesis (EMH).

Introduced by Eugene Fama in the 1960s, the essence of EMH is that at any

A d3 recreation of Etsy's shopping by color animation.

Learning D3

1. Read Up

Spend a few hours (minimum) going through these materials. It's okay if you don't understand half of it on your first time through (75% is way too much though). I found it super helpful to write out the code snippets and test them out while following along. There are now quite a few D3 tutorials out there, but I found these particularly helpful:

	<!doctype html>
	<html>
	<head>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
	<link type="text/css" rel="stylesheet" href="style.css"/>
	<style type="text/css"></style>
	</head>
	<body>
	<p id="chart">
	<p id="menu"><b>Top States by Age Bracket, 2008</b><br>Age: <select></select>

	var width = 660,
	height = 600;

	var color = d3.scale.linear()
	.domain([0, width/4, width/4 * 2, width/4 * 3, width])
	.range(["#fb000f", "#6e00fb", "#00fbec", "#8dfb00", "#fb3c00"])
	.interpolate(d3.interpolateHsl);

	var svg = d3.select("#colorz").append("svg")
	.attr("width", width)

	(function(){

	var width = 660,
	height = 460;

	var edById = {},
	nameById = {};

	var formatNum = d3.format(",.0f"),
	formatPercent = d3.format(",.0%");

	(function(){

	// select grouped radio button (since i couldn't seem to do it in markdown)
	d3.select('input[value="grouped"]').property('checked', true);

	var data = [
	[
	{x: 'A', y: 1102, z: 'Brazil'}, {x: 'B', y: 1507, z: 'Spain'}, {x: 'C', y: 1200, z: 'Columbia'}, {x: 'D', y: 1132, z: 'Uruguay'},
	{x: 'E', y: 1113, z: 'Switzerland'}, {x: 'F', y: 1251, z: 'Argentina'}, {x: 'G', y: 1318, z: 'Germany'}, {x: 'H', y: 1098, z: 'Belgium'}
	],


	<!DOCTYPE html>
	<!-- saved from url=(0014)about:internet -->
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
	<meta http-equiv="x-ua-compatible" content="IE=9" >

	<title>Title</title>

	cat 1/.txt 2/.txt 3/.txt 4/.txt 5/*.txt > combined.txt

	awk '{arr[$1]+=1} END {for (i in arr) {print i,arr[i]}}' combined.txt > counts.txt

	sort -nrk 2 counts.txt