## Events Search and Views Navigation

## March 2020

## April 2020

### Introduction to ggplot2

This seminar will be conducted over Zoom. Link to follow after registration is complete. Description: The ggplot2 package is a widely-used and well-supported system for creating eye-catching graphics in R. In this interactive workshop, you will learn the underlying grammar of graphics that forms the philosophical framework of ggplot2, giving you the power to create publication-quality figures intuitively. The workshop is interactive, in which attendees are encouraged to participate in R coding to create their own statistical graphics. The notes…

Find out more »## May 2020

### Introduction to Mplus 8

This seminar will be conducted over Zoom. Link to follow after registration is complete. Description: Mplus is a powerful statistical package used for the analysis of latent variables. Among the kinds of analysis it can perform are exploratory factor analysis, confirmatory factor analysis, latent class analysis, latent growth curve modeling, structural equation modeling and multilevel modeling. The program can handle a combination of categorical and continuous variables and often permits missing data. It integrates these analyses into a single framework…

Find out more »### R Data Management

This seminar will be conducted over Zoom. Link to follow after registration is complete. Description: This workshop introduces R packages and functions that help users import, transform and manage their data in preparation for analysis. The seminar focuses on the “tidy data” philosophy encouraged y the “tidyverse” collection of R packages, but draws on other packages for useful functions as needed. Topics include data import, transforming variables, string functions, missing data, merging datasets, reshaping data, grouped data processing, and looping.…

Find out more »### A Practical Introduction to Exploratory Factor Analysis (EFA) in SPSS

This seminar will be conducted over Zoom. Link to follow after registration is complete. Description: This workshop will give a practical overview of exploratory (EFA) in SPSS. Topics to be covered include factor extraction, principal components analysis, estimation methods, factor rotation, refining the factor structure, and generating factor scores for subsequent analyses. The notes for the workshop are here. This workshop will not be hands-on. Attendance is restricted to researchers from the University of California. The information for the Zoom meeting…

Find out more »### Power and Sample Size in Stata

In this talk I introduce the concepts and jargon of power and sample size calculations such as alpha levels, power, and minimum detectable effect sizes. I do several simple calculations manually and then demonstrate how to replicate these calculations using Stata's -power- commands. Next I demonstrate how to create tables and graphs for power, sample size, and minimum detectable effect sizes for a range of values. We will conclude with a discussion of strategies to increase statistical power. The second…

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