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Alex Lenail
Alex Lenail

193 Followers

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Sep 13, 2017

Understanding and Implementing the hypergeometric test in python

Whenever I find a topic I can’t find a sufficiently good tutorial or explanation of online, I feel compelled to offer one. I hope this helps you. I. Understanding the Hypergeometric Distribution The hypergeometric distribution describes the probability of events in the following scenario: Suppose you have a jar containing 10 red marbles and 90…

Bioinformatics

3 min read

Understanding and Implementing the hypergeometric test in python
Understanding and Implementing the hypergeometric test in python
Bioinformatics

3 min read


Jul 31, 2017

What is the difference between Ridge Regression, the LASSO, and ElasticNet?

tldr: “Ridge” is a fancy name for L2-regularization, “LASSO” means L1-regularization, “ElasticNet” is a ratio of L1 and L2 regularization. If still confused keep reading… — Logistic Regression This article is about different ways of regularizing regressions. In the context of classification, we might use logistic regression but these ideas apply just as well to any kind of regression or GLM. With binary logistic regression, the goal is to find a way to separate your two classes. …

Machine Learning

7 min read

What is the difference between Ridge Regression, the LASSO, and ElasticNet?
What is the difference between Ridge Regression, the LASSO, and ElasticNet?
Machine Learning

7 min read


May 7, 2016

Models

“ ‘All models are wrong, but some are useful.’ So proclaimed statistician George Box 30 years ago, and he was right. But what choice did we have? Only models, from cosmological equations to theories of human behavior, seemed to be able to consistently, if imperfectly, explain the world around us…

Machine Learning

11 min read

Models
Models
Machine Learning

11 min read


Nov 12, 2015

A note to future hackathon organizers

Reflections from Tufts Polyhack, October 23–24, 2015 — Some four years ago, I attended Tufts’ first hackathon put on by Marshall, and it changed the course of my life in a pretty profound way. …

Tufts

24 min read

A note to future hackathon organizers
A note to future hackathon organizers
Tufts

24 min read


Oct 15, 2015

Led By Sheep

Climbing rocks is probably the best way I know of to slowly lose all your time and money. There is hardly a better way of doing so. I was climbing near Aspen, CO, when the opportunity arose to go to southern Utah to see my godfather’s daughter (also my father’s…

Climbing

6 min read

Led By Sheep
Led By Sheep
Climbing

6 min read


Aug 23, 2015

That Time We Built a Climbing Wall In Our Backyard…

For me, Climbing is yoga on a vertical surface. It’s a negotiation between your will and gravity, and demands a holistic self-discipline I had been craving without knowing it. And its unfathomably addictive. I started rock-climbing on a whim. Sometime in early October of last year, a friend invited me…

Climbing

6 min read

That Time We Built a Climbing Wall In Our Backyard…
That Time We Built a Climbing Wall In Our Backyard…
Climbing

6 min read


Aug 21, 2015

I want to send emails from my google domains email through gmail.

I registered my domain foo.com through google domains, and then I setup email forwarding so that emails sent to alex@foo.com go to alex@gmail.com, but now I want to send email from alex@foo.com. Well, I went through the support channels at Google domains — so you don’t have to. To set…

Gmail Technical Support

4 min read

I want to send emails from my google domains email through gmail.
I want to send emails from my google domains email through gmail.
Gmail Technical Support

4 min read


Jul 5, 2015

The way we talk about Ethics is broken

An analogy with the Neural Network Algorithm — I’m going to try and explain to you why I believe discussions on the subject of ethics, especially of the abstract variety, in which seemingly well warranted postulations about the nature of morality abound, are not only entirely futile but morally hazardous. …

Ethics

11 min read

The way we talk about Ethics is broken
The way we talk about Ethics is broken
Ethics

11 min read


Feb 6, 2015

Torres Del Paine ‘O Loop’ in 4.5 days

Despite what others tell you, it can be done. — But is that enough time to fully savor the park? Torres Del Paine is one of the great natural treasures on the face of this planet, and a friend and I recently had the great pleasure of experiencing it. The Torres were the first stop in our Patagonian expedition, which was all too short, and wanting to do as much…

13 min read

Torres Del Paine ‘O Loop’ in 4.5 days
Torres Del Paine ‘O Loop’ in 4.5 days

13 min read


Nov 14, 2014

Optimizing Transmission of Knowledge

In response to The Economist’s The Future of the Book To me, the really fascinating thing about books is the ecosystem they've given rise to. Books have essentially promulgated a set of cultural artifacts and institutions which allow them to replicate and disseminate themselves safely throughout our world. …

4 min read

Optimizing transmission of knowledge
Optimizing transmission of knowledge

4 min read

Alex Lenail

Alex Lenail

193 Followers

conscious mammalian organism, fanatical tea snob.

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