Re: Repeated measures in large data set

Posted by Art Kendall on Nov 17, 2013; 1:19pm
URL: http://spssx-discussion.165.s1.nabble.com/Repeated-measures-in-large-data-set-tp5723115p5723120.html

Whether or not statistically different differences are meaningful is not a statistical matter but a substantive area matter.  Do the differences pass the "Who cares?" test (aka as the "So what?" test.)
On 11/16/2013 3:01 PM, NomiW [via SPSSX Discussion] wrote:

I have a date set with approximately 1,000,000 people. Medication usage was
recorded monthly throughout one calendar year (i.e. each person has 12 time
points). The variables are numeric and refer to dosage.
I'm interested in comparing use across time, between two different regions and
three different groups. I've run Repeated Measures models with factors and
interactions. Everything is significant because the n is so large. Is there a
better way to do this? The differences between months are very small but all
pairwise comparisons are significant. How do I know which are meaningful?
(I'm particularly interested in comparing one month to the preceding and
following months).

Thanks!

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