Home page of Evan Miller

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SOFTWARE (RSS)	WRITINGS (RSS)
NEW Evan's Awesome A/B Tools 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 data nerds: Wizard – Intuitive statistical analysis tool Magic Maps – Easy mapping and analysis ProjCL – Secret map-projection sauce For Erlang developers: Chicago Boss – An Erlang web framework BossDB – An evented ORM for Erlang ErlyDTL – Django's template language compiled to Erlang bytecode Aleppo – Alternative Erlang Pre-Processor Jerome – Erlang 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. For MediaWiki administrators: Google Maps Extension – Embed and edit Google Maps in your wiki. Software references for Nginx developers: Emiller's Guide to Nginx Module Development – The guide that started it all... somewhat dated. Emiller's Advanced Topics In Nginx Module Development – The sequel. Software references for Erlang developers: 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.	Applied math: NEW Announcing Evan's Awesome A/B Tools – Free, visual statistical calculators. NEW 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. Linear Regression For Fun And Profit – Machine-learning on the cheap. How Not To Sort By Average Rating – We all make mistakes. Rank Hotness With Newton's Law of Cooling – A simple equation for showing what's fresh on a website. How Not To Run An A/B Test – The hazards of repeated significance testing. Holt-Winters Forecasting Applied to Poisson Processes in Real-Time (pdf) – Monitoring business metrics. Random musings NEW 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? Miscellaneous software notes: NEW How To Get Great Ratings For Your Mac App – learn from my mistakes. NEW Why I Develop For The Mac – and why you probably shouldn't. 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.

SOFTWARE
(RSS)

WRITINGS
(RSS)

NEW Evan's Awesome A/B Tools

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 data nerds:

Wizard – Intuitive statistical analysis tool
Magic Maps – Easy mapping and analysis
ProjCL – Secret map-projection sauce

For Erlang developers:

Chicago Boss – An Erlang web framework
BossDB – An evented ORM for Erlang
ErlyDTL – Django's template language compiled to Erlang bytecode
Aleppo – Alternative Erlang Pre-Processor
Jerome – Erlang 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.

For MediaWiki administrators:

Google Maps Extension – Embed and edit Google Maps in your wiki.

Software references for Nginx developers:

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

Software references for Erlang developers:

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.

Applied math:

NEW Announcing Evan's Awesome A/B Tools – Free, visual statistical calculators.
NEW 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.
Linear Regression For Fun And Profit – Machine-learning on the cheap.
How Not To Sort By Average Rating – We all make mistakes.
Rank Hotness With Newton's Law of Cooling – A simple equation for showing what's fresh on a website.
How Not To Run An A/B Test – The hazards of repeated significance testing.
Holt-Winters Forecasting Applied to Poisson Processes in Real-Time (pdf) – Monitoring business metrics.

Random musings

NEW 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?

Miscellaneous software notes:

NEW How To Get Great Ratings For Your Mac App – learn from my mistakes.
NEW Why I Develop For The Mac – and why you probably shouldn't.
- 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.