I'm a lecturer in the Department of Statistics, at the University of California, Berkeley. Teaching undergraduate courses has been my main professional activity for the past six years. However, for about a decade and a half, I've spent my time:

- authoring materials (e.g. books, tutorials, slides) for teaching purposes,
- using graphical displays to understand data with visualization,
- programming and applying multivariate methods for exploring, analyzing, and visualizing data in a context of multiple variables and high dimensionality,
- reflecting about computational reproducibility topics and open science,
- and helping researchers and scientists analyze their data.

If you find any value and usefulness in the resources of this site, please consider making a **one-time donation in any amount**. Your support really matters.

Alternatively, you can also help me with my Amazon wishlist.

**All Models Are Wrong: Concepts of Statistical Learning**

Introductory text about concepts of Statistical Learning, covering some of the common supervised as well as unsupervised methods (work in progress).

**A Matrix Algebra Companion for Statistical Learning**

The purpose of this book is to help you understand how statistical notions are connected to matrix algebra concepts that constantly appear around Statistical Learning methods (work in progress).

**Principal Component Analysis for Data Science**

This book aims to provide an introduction to Principal Component Analysis for Data Science.

**Introduction to Computing with Data**

This is an introductory book to computational data analysis with an emphasis on principles of data manipulation using R, data technologies, and basics of command line interface (work in progress).

This book aims to help you get started with manipulating strings with R. It provides an overview of several resources that you can use for string manipulation. It covers useful functions in packages "base" and "stringr", printing and formatting characters, regular expressions, and other tricks.

This book aims to help you get started with the creation of a basic R package, based on the so-called S3 classes.

This little book focuses on the basics, and not so basics, of R factors (work in progress).

This book provides a hands-on introduction to Partial Least Squares Path Modeling (PLS-PM) using the R package "plspm".

What we know today as Partial Least Squares (PLS) is the result of a long period of evolution, with a vast range of methods and techniques proposed since the late 1960s / early 1970s. This book narrates the story behind the origins, development, and evolution of PLS methods.

Some of the courses I've taught in the Department of Statistics, UC Berkeley.

**Stat 2**: Introduction to Statistics**Stat 20**: Introduction to Probability and Statistics**Stat 131A**: Introduction to Probability and Statistics for Life Scientists**Stat 133**: Concepts in Computing with Data**Stat 151A**: Linear Modeling**Stat 154**: Modern Statistical Prediction and Machine Learning**Stat 159**: Reproducible and Collaborative Statistical Data Science**Stat 243**: Introduction to Computational Statistics

- Unix basics
- Command Line
- Customizing Bash shell
- Filesystem
- Working with files and directories
- Pipes and redirections

- Introduction
- Classic Examples
- Visualization Basics
- Visual System
- Visual Perception
- What is Color
- Color Vision
- Effective Charts
- Various Examples
- Graphing Process
- Entertainment

- Introduction
- Reading Files from the Web
- Basics of XML and HTML
- Parsing XML / HTML content
- Handling JSON Data
- HTTP Basics and RCurl Package
- Getting Data via Web Forms
- Getting Data via Web APIs

- Introduction
- Various Dependencies
- Various Targets
- Dependent Targets
- File System
- Phony Targets
- Defining Variables
- Automatic Variables
- Wildcard Function
- Pattern Rules
- Pattern Substitutions

- Introduction
- Setting up your PC
- Anatomy of an R package
- Standard (painful) Development
- Building and Checking
- Develop smarter, not harder

I'm a passionate R user, and in a not so distant past, I was an active developer and maintainer of several R packages. All the code is available in my github repositories.

**plspm** provides a toolkit exclusively dedicated to Partial Least Squares Path Modeling (PLS-PM) analysis.

**pathmox** is dedicated to the Pathmox approach for obtaining segmentation trees in PLS-PM analysis.

**plsdepot** provides a set of tools for performing Partial Least Squares (PLS) analysis of one or two data tables.

**arcdiagram** is a minimalist package to help you plot pretty arc diagrams in R.

**colortools** is designed to help users generate color schemes and color palettes.

**pathdiagram** provides simple functions to draw basic PLS path diagrams in R.

**cointoss** is a toy package with simple functions for simulating tossing a coin.

**dieroller** is a toy package with simple functions for simulating rolling a die.

**binomial** is a toy package with simple functions for computing binomial probabilities.

**matrixkit** is an R package that provides a first aid kit for some matrix operations commonly used in multivariate data analysis methods.

**turner** provides a set of handy functions to turn vectors (and lists of vectors) into other indexed data structures.

**tester** provides human readable functions to test characteristics of some common R objects.

Slides of some old talks.

**Rtist**: weird but beautiful random paintings.

**Got Plot**: tiny collection of polished charts in R.

**Star Wars Arc Diagram**: visualizing Star Wars movie scripts.

**genbiovis**: deprecated experiment for visualizing titles of genetics & biology papers

**Mining twitter with R**: deprecated experiment that keeps catching people's attention.

Some years ago I used to talk about data analysis, visualization, statistics, R and related stuff in my blog Data Analysis Visually EnfoRced (unfortunately, I haven't had the time to do that anymore).

**Fundamentos Teoricos de Maniobras con Cuerdas**

In a past life I used to be a rope techniques and rigging enthusiast (yes, seriously). Such was my fascination that I even wrote a book in Spanish about the theoretical fundamentals of Rope Techniques.

Once in a blue moon, my alter ego feels compelled to write—mostly in my mother tongue—what to me seems, feels and sounds like poetry-ish. I call them *Poemario*, a random collection of personal poems in Spanish.

Photo album of an assortment of utility poles (transmission poles, telephone poles, power poles, etc).