Wizard Statistical analyzer

Magic Maps Mapping and analysis

NEW 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?

For map geeks:

• ProjCL – Secret map-projection sauce
• Google Maps Extension – Embed and edit Google Maps in your wiki.

For Erlang developers:

• Awesome web framework:
  • Chicago Boss – Like RoR, but better
  
  
• Libraries:
  • BossDB – An evented ORM for Erlang
  • ErlyDTL – Django template language
  • Aleppo – Erlang Pre-Processor
  • Jerome – Rich-text processing library

For Nginx administrators:

• mod_circle_gif – Serve round corners with colors specified in the URL. The original Nginx module!
• mod_zip – Assemble ZIP archives on the fly. Originally developed for box.net in Palo Alto.
• nginx_upstream_hash – A hashing load balancer.
• mod_rrd_graph – Link RRDtool's graphing facilities directly into Nginx.
• nginx.vim – Syntax highlighting for the world's best text editor.

• NEW Lazy Assignment and A/B Testing – Increase your statistical power today by applying this one weird tip.
• Announcing Evan's Awesome A/B Tools – Free, visual statistical calculators.
• Linear Regression For Fun And Profit – Machine-learning on the cheap.
• How Not To Run An A/B Test – The hazards of repeated significance testing.

• NEW Statistical Formulas for Programmers – A cornucopia of useful equations collected in one place.
• Fixing a Hole in the F-Distribution – The story of a subtle bug.
• How To Read an Unlabeled Sales Chart – Photoshop is no match for math
• Bayesian Average Ratings – A different perspective on a classic problem.
• How Not To Sort By Average Rating – We all make mistakes. Popular article, almost 250,000 page views!
• Rank Hotness With Newton's Law of Cooling – A simple equation for showing what's fresh on a website.
• Holt-Winters Forecasting Applied to Poisson Processes in Real-Time (pdf) – Monitoring business metrics.

• Predictive Analytics: What Is It Good For? – The shocking truth.
• The Mathematical Hacker – Why hackers need math, now more than ever.
• Big Data and the Price-Precision Curve – Significant digits have a significant cost.
• Don't Kill Math – Comments on Bret Victor's scientific agenda.
• In Praise of Small Data – Never use Big Data if Small Data will do.
• The Feature Matrix – How many features should an app have?

• How To Get Great Ratings For Your Mac App – learn from my mistakes.
• Why I Develop For The Mac
  • Follow-up: Hackers and <canvas>
• Winkel Tripel Warping Trouble; or, How I found a bug in the Journal of Surveying Engineering
• Why I Program In Erlang – and you should too, maybe.
• Notes on Rendering 2D Graphics on a Mac – Picking the right tool for the job.
• Premature Optimization and the Rise of Nginx Module Development – Round corners à gogo.
• Functional Tests As A Tree Of Continuations – DRY applied to functional tests.

• Chicago Boss: A Rough Introduction – A tutorial for the Erlang web framework.
• The Joy of Erlang; Or, How To Ride A Toruk – A beginner's guide to Erlang.
• Write a Template Compiler for Erlang – To my knowledge, no one has actually used this. But there's good stuff in here.

• Emiller's Guide to Nginx Module Development – The guide that started it all... somewhat dated.
• Emiller's Advanced Topics In Nginx Module Development – The riveting sequel.