Confusion in terms in "Long" and "Wide Format" for longitudinal and intensive longitudinal studies.

 

The terms “wide format” and “long format” have different meanings in intensive longitudinal (IL) and longitudinal studies (see 1, 2, 3).  In IL studies (and, thus, in LifeData datasets), each row is devoted to an individual prompt in long format, while in wide  format each row is devoted to a session of prompts (i.e., a series of prompts delivered in one sampling event). 

 

 

Wide

Long

Intensive longitudinal

Each session has a row

Each prompt has a row

Longitudinal

Each ID has a row

Each session has a row

 

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