John Swain swainjo

FIS Alpine Skiing seasons

Introduction

Movie Recommendations with k-Nearest Neighbors and Cosine Similarity

Introduction

The k-nearest neighbors (k-NN) algorithm is among the simplest algorithms in the data mining field. Distances / similarities are calculated between each element in the data set using some distance / similarity metric ^^[1]^ that the researcher chooses (there are many distance / similarity metrics), where the distance / similarity between any two elements is calculated based on the two elements' attributes. A data element’s k-NN are the k closest data elements according to this distance / similarity.

1. A distance metric measures distance; the higher the distance the further apart the neighbors. A similarity metric measures similarity; the higher the similarity the closer the neighbors.

Country Opinions

In the video game Elite:Dangerous players can buy and sell commodities at stations around the galaxy. This gist shows how to use Neo4j and Cypher queries for trading decisions in this game.

	=== Load Sample Data

	//setup
	//hide
	[source,cypher]
	----
	create
	(_8:`Tweet` {`created_at`:"Tue Sep 16 07:49:19 +0000 2014", `favorites`:0, `id`:511783879238488064, `text`:"RT @selinasorrels: DON'T BE AFRAID~~~ BE AWARE...Computer Models Tell Us That This Ebola Pandemic Could Soon Kill Millions... #Geo-Eng~
	ht…"}),
	(_9:`User` {`followers`:193, `following`:282, `location`:"Lelystad 06-22.44.69.21", `name`:"Harmen Bouwstra", `profile_image_url`:"http://pbs.twimg.com/profile_images/498588508273922048/PrR7_4zL_normal.jpeg", `screen_name`:"HBouwstra"})

	== Green Man POC
	:neo4j-version: neo4j-2.1
	:author: John Swain
	:twitter: @swainjo
	:tags: domain:POC

	=== Load Sample Data

	//setup
	//hide

	<!DOCTYPE html>

	<html xmlns="http://www.w3.org/1999/xhtml">

	<head>

	<meta charset="utf-8">
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta http-equiv="Content-Style-Type" content="text/css" />
	<meta name="generator" content="pandoc" />

	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	width: 960px;
	height: 500px;
	position: relative;
	}