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Questions tagged [longitudinal]

Longitudinal is a term to describe time-series data.

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Historical data of languages spoken in country by percent population?

I am looking for a dataset that contains the languages spoken in each country and their respective percentages of the population, going back as far back into the historical record as possible. I ...
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Where can I find the Iowa Fluoride Study(IFS) data?

Anyone know where can I find the Iowa Fluoride Study data? Thanks
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Where can I find repeated measures data arising from longitudinal studies involving psychometric tests?

Where can I find repeated measures data arising from longitudinal studies involving psychometric tests? I'm mostly interested in mental health data but I am open to other suggestions.
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Contractual data over multiple years

To build models to predict customer behavior, I am searching for individual-level contractual data over multiple years (i.e. > 3 years). My focus is to assess the quality of long-term predictions, ...