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two overlapping histograms

Bayesian Modeling Primer

bayesian
python
An intuitive introduction to the Bayesian statistical workflow including modeling, inference, and interpretation of results.
Jun 4, 2025

The enso circle

Analyzing After Tax Retirement Income: Roth vs. Traditional 401(k)

personal finance
Quantitative analysis of Roth vs. traditional 401(k)—which is better for you?
Dec 14, 2024

snow, trees, and mountains overlook lake Tahoe

SHAP from Scratch

python
from scratch
How to compute SHAP values from scratch in python
Aug 4, 2024

lunar halo

The Ultimate Guide to XGBoost Parameter Tuning

python
tutorial
gradient boosting
xgboost
My approach for efficiently tuning XGBoost parameters with optuna in python
Dec 26, 2023

XGBoost for Binary and Multi-Class Classification in Python

python
tutorial
gradient boosting
xgboost
A step-bystep tutorial on binary and multi-class classification with XGBoost in python using sklearn and the xgboost library
Nov 28, 2023

wild aloe plants growing at Cape Point

Gradient Boosting Multi-Class Classification from Scratch

python
gradient boosting
from scratch
How to implement multi-class classification for gradient boosting from scratch in python
Oct 15, 2023

branches reach into the Kigali sky

XGBoost for Regression in Python

python
tutorial
gradient boosting
xgboost
A step-bystep tutorial on regression with XGBoost in python using sklearn and the xgboost library
Sep 18, 2023

quarto, jupyter, and python logos together on a white background

Blogging with Quarto and Jupyter: The Complete Guide

python
tutorial
blogging
Step-by-step tutorial and best practices for creating a python blog with quarto and jupyter
Sep 6, 2023

Christ the Redeemer towers into an empty blue sky

Random Realizations Resurrected

blogging
The world’s favorite data science blog is back.
Aug 2, 2023

A weathered tree reaches toward the sea at Playa Mal País

XGBoost from Scratch

python
gradient boosting
xgboost
from scratch
A walkthrough of my from-scratch python implementation of XGBoost.
May 7, 2022

Tree branches on a chilly day in Johnson City

XGBoost Explained

gradient boosting
xgboost
In-depth explanation and mathematical derivation of the XGBoost algorithm
Mar 13, 2022

binary tree diagram

Decision Tree from Scratch

python
gradient boosting
from scratch
A detailed walkthrough of my from-scratch decision tree implementation in python.
Dec 13, 2021

A California cypress tree abides in silence on Alameda Beach

Consider the Decision Tree

gradient boosting
Understand the core strengths and weaknesses of the decision tree, and see how ensembling makes trees shine.
Dec 12, 2021

Cold water cascades over the rocks in Erwin, Tennessee.

How to Implement a Gradient Boosting Machine that Works with Any Loss Function

python
gradient boosting
from scratch
Summarize Friedman’s seminal GBM paper and implement the generic gradient boosting algorithm to train models with any differentiable loss function.
Oct 23, 2021

A big day at Playa Guiones

Hello PySpark!

python
PySpark
tutorial
Get up and running fast with a local pyspark installation, and learn the essentials of working with dataframes at scale.
Jun 22, 2021

A whiteboard session at Playa Pelada

How Gradient Boosting Does Gradient Descent

gradient boosting
Understand how gradient boosting does gradient descent in function space to minimize any differentiable loss function in the service of creating a good model.
Apr 27, 2021

dancer getting down

Get Down with Gradient Descent

gradient boosting
Get down with the intuition for gradient descent via a fresh analogy, develop the mathematical formulation of the algorithm, and implement it from scratch to train a linear regression model.
Jan 22, 2021

SF buzzes silently in the distance

How to Build a Gradient Boosting Machine from Scratch

python
gradient boosting
from scratch
Understand the intuition behind the gradient boosting machine (GBM) and learn how to implement it from scratch.
Dec 8, 2020

8020 pandas

The 80/20 Pandas Tutorial

python
pandas
tutorial
An opinionated pandas tutorial on my preferred methods to accomplish the most essential data transformation tasks in a way that will make veteran R and tidyverse users smile.
Nov 25, 2020

Matt raises his arms in joy at the world.

Hello World! And Why I’m Inspired to Start a Blog

blogging
A reflection on what inspired me to start a blog and three reasons I think it could be a good idea.
Nov 22, 2020
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