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The Codex
Good and Bad Reasoning
Argument and Analysis
Categorisation and Concepts
Probability and Predictions
The Institution of Science
Studies and Statistics
Research and Reviews
Hypotheses and Hunches
Designing the World
Politics and Pragmatics
Economics and Efficiency
Futurism and Forecasting
Community and Cooperation
Epilogue
Parables and Prayers

The Codex

The Codex is a collection of essays written by Scott Alexander that discuss how good reasoning works, how to learn from the institution of science, and different ways society has been and could be designed. It also contains several short interludes containing fictional tales and real-life stories. The essays contained have been widely read within the rationality and effective altruism communities, and have a strong bias towards actually reading the scientific papers being discussed, analysing the arguments closely, and taking the conclusions seriously.

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Good and Bad Reasoning

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Argument and Analysis

A sequence of essays by Scott Alexander on how arguments work, how to use them, and how to misuse them.

88 min read
Eight Short Studies On Excuses
Schelling fences on slippery slopes
Intellectual Hipsters and Meta-Contrarianism
Cardiologists and Chinese Robbers
All Debates Are Bravery Debates
The Virtue of Silence
Proving Too Much
Beware Isolated Demands For Rigor
Interlude
Transhumanist Fables
…And I Show You How Deep The Rabbit Hole Goes
Categorisation and Concepts

"The essay “How An Algorithm Feels From The Inside” is a gift that keeps on giving. You can get a reputation as a daring and original thinker just by copy-pasting it at different arguments with a couple of appropriate words substituted for one another, mad-libs like. It is the solution to something like 25% of extant philosophical problems."

73 min read
Diseased thinking: dissolving questions about disease
The Categories Were Made For Man, Not Man For The Categories
The noncentral fallacy - the worst argument in the world?
Ethnic Tension And Meaningless Arguments
Interlude
The Moral Of The Story
Probability and Predictions

Nearly everyone is very very very overconfident. We know this from experiments where people answer true/false trivia questions, then are asked to state how confident they are in their answer. If people’s confidence was well-calibrated, someone who said they were 99% confident (ie only 1% chance they’re wrong) would get the question wrong only 1% of the time. In fact, people who say they are 99% confident get the question wrong about 20% of the time.

It gets worse. People who say there’s only a 1 in 100,000 chance they’re wrong? Wrong 15% of the time. One in a million? Wrong 5% of the time. They’re not just overconfident, they are fifty thousand times as confident as they should be.

57 min read
The Pyramid And The Garden
On Overconfidence
If It’s Worth Doing, It’s Worth Doing With Made-Up Statistics
Techniques for probability estimates
Confidence levels inside and outside an argument
Interlude
The Logician And The God-Emperor
Reverse Psychology

The Institution of Science

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Studies and Statistics


Aquinas famously said: beware the man of one book. I would add: beware the man of one study.

For example, take medical research. Suppose a certain drug is weakly effective against a certain disease. After a few years, a bunch of different research groups have gotten their hands on it and done all sorts of different studies. In the best case scenario the average study will find the true result – that it’s weakly effective.

But there are also about 5 studies that find that the drug is very good, and 5 studies missing the sign entirely and finding that the drug is actively bad. There’s even 1 study finding that the drug is very bad, maybe seriously dangerous.

140 min read
Beware The Man Of One Study
Debunked And Well-Refuted
Noisy Poll Results And Reptilian Muslim Climatologists from Mars
Two Dark Side Statistics Papers
The Control Group Is Out Of Control
The Cowpox of Doubt
How Common Are Science Failures?
Learning To Love Scientific Consensus
Interlude
My IRB Nightmare
The Study of Anglophysics
Research and Reviews

Synthesising scientific knowledge to answer a policy question is difficult. This sequence is a series of attempts to do just that, with intricate and winding literature reviews.

191 min read
Much More Than You Wanted to Know
Marijuana: Much More Than You Wanted To Know
Wheat: Much More Than You Wanted To Know
SSRIs: Much More Than You Wanted To Know
Alcoholics Anonymous: Much More Than You Wanted To Know
Prescriptions, Paradoxes, and Perversities
Guns And States
Teachers: Much More Than You Wanted To Know
Antidepressant Pharmacogenomics: Much More Than You Wanted To Know
Interlude
A Story With Zombies
Asches to Asches
Hypotheses and Hunches

52 min read
The Atomic Bomb Considered As Hungarian High School Science Fair Project
It’s Bayes All The Way Up
Why Are Transgender People Immune To Optical Illusions?
Interlude
The Case Of The Suffocating Woman

Designing the World

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Politics and Pragmatics

91 min read
I Can Tolerate Anything Except The Outgroup
Book Review: Albion’s Seed
Albion’s Seed, Genotyped
Society Is Fixed, Biology Is Mutable
Interlude
A Philosopher Walks Into A Coffee Shop
The Witching Hour
Economics and Efficiency

163 min read
Marginally Important Econ Questions
Against Tulip Subsidies
Considerations On Cost Disease
Highlights From The Comments On Cost Disease
The Price Of Glee In China
Things Probably Matter
How The West Was Won
Interlude
The Lizard People Of Alpha Draconis 1 Decided To Build An Ansible
A Modern Myth
Futurism and Forecasting

A sequence of futurism discussion that includes AGI, brain emulations and the Fermi paradox.

156 min read
Superintelligence FAQ
AI Researchers On AI Risk
Should AI Be Open?
SSC Journal Club: AI Timelines
Where The Falling Einstein Meets The Rising Mouse
Don’t Fear The Filter
Book Review: Age of Em
Ascended Economy?
Interlude
G.K. Chesterton On AI Risk
[REPOST] The Demiurge’s Older Brother
Community and Cooperation
189 min read
In Favor of Niceness, Community, and Civilization
Guided By The Beauty Of Our Weapons
The Ideology Is Not The Movement
Archipelago and Atomic Communitarianism
Meditations On Moloch
Interlude
Five Planets In Search Of A Sci-Fi Story
It Was You Who Made My Blue Eyes Blue

Epilogue

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Parables and Prayers

69 min read
Burdens
The Parable Of The Talents
Nobody Is Perfect, Everything Is Commensurable
Interlude
Answer to Job
Universal Love, Said The Cactus Person
The Goddess of Everything Else