Journal of Neuroinformatics and Neuroimaging

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Short Communication - Journal of Neuroinformatics and Neuroimaging (2022) Volume 7, Issue 1

Neuroimaging: Capturing nonlinear relationships with longitudinal studies.

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Abstract

There are two types of variables in statistical modeling. The first type is categorical (e.g., sex, group, condition), and its possible categories are treated as the levels of a factor. The other type is quantitative, in which numerical values represent measurements. Sometimes a variable can be treated one way or another depending on the research focus and hypothesis. For example, when a group of subjects are scanned once during each of five consecutive years, the five time points can be modeled as a factor with 5 levels when the differences among them, irrespective of order, are of interest.

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