In regression, we are often interested in an interaction, which is the modification of the effect of an independent variable by another. Interactions can be decomposed in three ways, by 1) testing each effect against zero, 2) testing differences among effects, and 3) graphing. This workshop will demonstrate how to do all three analyses in R for the following interaction models: continuous-by-continuous, categorical-by-continuous, and categorical-by-categorical. Some hands-on exercises will be presented. Recommended: Prior knowledge of linear regression and a laptop…

This short course will cover the basics of the Go language for those who already are familiar with an imperative programming environment like Python. The Go programming language (golang) is a simple, high-performance imperative programming language. It has the benefits of a strongly typed, compiled language along with many of the benefits of popular scripting languages like Python. The course will assume familiarity with another imperative language so we can use comparisons (to Python) to leverage familiarity and move quickly.…

We will discuss how to effectively run jobs on Hoffman2 cluster. Hoffman2 cluster serves a wide spectrum of user applications and is almost always heavily loaded. We will first review the model and policy of Hoffman2's job scheduling, followed by fundamentals of using its job scheduler, Univa Grid Engine. A number of common use cases will be discussed in details, including: (1) Single-CPU jobs, (2) Multi-CPU, same-node jobs, (3) Multiple-node (MPI-style) jobs and (4) Job arrays. If you have questions…

This workshop will help increase your skills in using logistic regression analysis with Stata.  The workshop does not teach logistic regression, per se, but focuses on how to perform logistic regression analyses and interpret the results using Stata.  It is assumed that you are familiar with logistic regression and Stata. This workshop will not be hands-on, but it will have an online component. Download notes for the workshop. NOTE: Please indicate if you will be attending in-person at UCLA or…

This short course will cover the basics of the Globus file transfer platform. We will discuss installation and configuration on Windows, MacOS, and Linux. Of particular interest will be using Globus from the command line. We will cover the installation of the GlobusCLI, initiating and monitoring transfers and some basic troubleshooting. The goal will be to develop basic skills that will enable the participant to incorporate GlobusCLI commands and data transfers into their workflows. A laptop and an account on…

The purpose of this workshop is to discuss commonly used techniques for handling missing data and common issues that could arise when these techniques are used. In particular, we will focus on the one of the most popular methods, multiple imputation and how to perform it in Stata. The Stata code for this seminar is developed using Stata 15. This workshop will not be hands-on, and it will not have an online component. Download the notes for the workshop. If…