No Cache

Member Training: Frailty Models

November 2nd, 2023 by

Most survival analysis models for time-to-event data, like Cox regression, assume independence. The survival time for one individual cannot influence the survival time for another.

This assumption doesn’t hold in many study designs. You may have animals clustered into litters, matched pairs, or patients in a multi-center trial with correlated survival times within a center.


Member Training: Group Comparisons

August 31st, 2023 by

How do you know which method to use when you want to compare groups?

Member Training: Using Macros, Loops, and Functions in Stata to Manage Your Data Software Tutorial

March 31st, 2023 by

Many data sets are challenging and time consuming to work with because the data are seldom in an optimal format.


Member Training: Moderated Mediation, Not Mediated Moderation

February 28th, 2023 by

Moderated mediation, also known as Conditional Process Modeling, is great tool for understanding one type of complex relationship among variables.


Member Training: Introduction to Stata Software Tutorial

September 30th, 2022 by

In this 8-part tutorial, you will learn how to get started using Stata for data preparation, analysis, and graphing. This tutorial will give you the skills to start using Stata on your own. You will need a license to Stata and to have it installed before you begin.


Member Training: A Gentle Introduction to Bootstrapping

July 28th, 2022 by

Bootstrapping is a methodology derived by Bradley Efron in the 1980s that provides a reasonable approximation to the sampling distribution of various “difficult” statistics. Difficult statistics are those where there is no mathematical theory to establish a distribution.