TAF Support

Member Training: Introduction to Item Response Theory and Rasch Models

November 1st, 2024 by

How do you know if the items of a test are hard or easy; fair or biased; accurate at measuring ability or not? 

Item Response Theory (IRT).

In this training, you will see, with real life examples, how IRT answers these questions to assess a test.

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Member Training: Types of Longitudinal, Repeated Measures, and Time Series

October 2nd, 2024 by

How do you know when to use a time series and when to use a linear mixed model for longitudinal data?

What’s the difference between repeated measures data and longitudinal?
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Member Training: Analyzing Longitudinal Data: Comparing Regression and Structural Equation Modeling Approaches

July 2nd, 2024 by

When analyzing longitudinal data, do you use regression or structural equation based approaches? There are many types of longitudinal data and different approaches to analyzing them. Two popular approaches are a regression based approach and a structural equation modeling based approach.

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Member Training: Coarsened Exact Matching, an Alternative to Propensity Score Matching

February 29th, 2024 by

The objective for quasi-experimental designs is to establish cause and effect relationships between the dependent and independent variables. However, they have one big challenge in achieving this objective: lack of an established control group.

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Member Training: Effective File and Process Management in Statistical Projects

January 31st, 2024 by
Do you ever wish your data analysis project were a little more organized?Stage 2

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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.

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