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logitudinal
2009 Jun 06
1
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This is not my understanding of the terms. To me, both time series
and longitudinal data can be regular or irregular, but time series data
typically have a lot more measurement points (20 at a minimum) and often
has only one or a few "subjects" - e.g. trends in the stock market. Logitudinal
data are often collected at fewer time points, but with many subject
(e.g. measuring people repeatedly to see if something about them changes
over time, and changes differently in different people).
Peter
Peter L. Flom, PhD
Statistical Consultant
www DOT peterflomconsulting DOT com