On 7/14/2013 3:05 PM, Rolf Turner wrote:
On 15/07/13 08:57, Spencer Graves wrote:
<SNIP>
You may know that "mixed effects" is another term for "repeated
measurements".
<SNIP>
I must of course preface this comment with an "I am no expert"
disclaimer, but I do not
believe that this assertion is correct. It would be more correct, I
believe, to say that
repeated measurement models form a particular sub-class of mixed
effects models.
Those who *are* experts may well correct me if I am wrong about this.
Thanks for the clarification, Rolf. You are absolutely correct.
"Repeated measurements" refers to the sampling plan. "Mixed effects"
describes a form of mathematical modeling. There are balanced repeated
measures data sets where people do not have to worry about the
subtleties of mixed-effects modeling. An experiment with multiple
litters with several mice in at least some of the litters would call for
mixed-effects modeling. This would include "repeated measures" on the
litters but not the mice.
However, "I am no expert" on repeated measures / mixed-effects,
either
Spencer
cheers,
Rolf
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