Wizard Statistical analyzer

Magic Maps Mapping and analysis

Evan's Awesome A/B Tools (home)

• Sample Size Calculator – How many subjects do you need for your experiment?

• Chi-Squared Test – Are the conversion rates statistically distinguishable?

• Two-Sample T-Test – Is the difference in means significant?

• Poisson Means Test – Does the arrival rate differ across two time periods?

Open-source projects I maintain:

• hecate – The hex editor from hell!
• ReadStat – Read SAS, Stata, and SPSS files
  • DataRead.jl – A wrapper for Julia
• ProjCL – Secret map-projection sauce
• TimeFormatStrings – Excel, Unicode, Stata
• DSShortNumberFormatter – An abbreviator

Open-source projects I help with:

• libxls – Read XLS files
• xlslib – Write XLS files
• haven – Read SAS/Stata/SPSS files into R

Stuff that still works:

• Erlang:
  • Chicago Boss – Web framework
  • BossDB – An evented ORM for Erlang
  • ErlyDTL – Django template language
  • Aleppo – Erlang Pre-Processor
  • Jerome – Rich-text processing library
• Nginx:
  • mod_zip – Streaming ZIP archiver
  • mod_circle_gif – Lots of round corners
  • mod_rrd_graph – Pretty pictures

Project graveyard:

• nginx_upstream_hash (2007-2014)
  A hashing load balancer for Nginx. RIP
• Google Maps Extension (2005-2012)
  Embed and edit Google Maps in your wiki. RIP

• NEW Splatoon's Ranking System Is Still Broken
• Evaluating Splatoon's Ranking System
• Inferring Tweet Quality From Retweets
• Ranking News Items With Upvotes
• Deriving the Reddit Formula
• Ranking Items With Star Ratings
• Statistical Formulas for Programmers
• How To Read an Unlabeled Sales Chart
• Bayesian Average Ratings
• How Not To Sort By Average Rating Popular article, almost 250,000 page views!
• Rank Hotness With Newton's Law of Cooling
• Holt-Winters Forecasting Applied to Poisson Processes in Real-Time (pdf)

• Simple Sequential A/B Testing
• Formulas for Bayesian A/B Testing
• Bayesian A/B Testing of Count Data
• The Low Base Rate Problem
• A/B Testing Duration Data
• Lazy Assignment and A/B Testing
• Announcing Evan's Awesome A/B Tools
• Linear Regression For Fun And Profit
• How Not To Run An A/B Test

• A Taste of Rust
• Four Days of Go
• Swift Impressions
• Why I'm Betting On Julia
• Why I Program In Erlang

• This Week in Wizard (Tumblr)

• Attracting Millennial Engineers
• The Software Scientist
• The Other Money Problem
• Start-ups and Emotional Debt
• You Can’t Dig Upwards
• Apple’s RAM Problem
• Marketing Your Startup Hub
• Predictive Analytics: What Is It Good For?
• The Mathematical Hacker
• Big Data and the Price-Precision Curve
• Don't Kill Math
• In Praise of Small Data
• The Feature Matrix

• Please Offer An Excel Export Option
• Statistical Shortcomings in Standard Math Libraries
• How To Get Great Ratings For Your Mac App
• Why I Develop For The Mac
  • Follow-up: Hackers and <canvas>
• Fixing a Hole in the F-Distribution
• Winkel Tripel Warping Trouble
• Notes on Rendering 2D Graphics on a Mac
• Premature Optimization and the Rise of Nginx Module Development
• Functional Tests As A Tree Of Continuations

• Chicago Boss: A Rough Introduction
• The Joy of Erlang; Or, How To Ride A Toruk
• Write a Template Compiler for Erlang

• Emiller's Guide to Nginx Module Development – Somewhat dated.
• Emiller's Advanced Topics In Nginx Module Development – The riveting sequel.