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1/5/2009
Monday morning
This topic is closed off and you will be taken directly to the website.
Topics taken from open source list. I hope you find this useful.
This site is for our clients only as an information resource.
| The Group main effect represents any systematic differences due to
whether the sequence of diets was (A,B,C) or (B,C,A) or (C,A,B).
The Diet main effect represents the effects presumably of interest, that
is, whether the three diets differed in amount of weight loss observed.
The Sequence effect shows whether being the 1st, 2nd, or 3rd diet in the
temporal sequence makes any difference. The remaining 2 d.f. for
assorted interactions is unlikely to be interesting, but if significant
might indicate something that might be worth pursuing. (The problem with
interactions in a Latin square is that GD interactions are confounded
with the S main effect, GS with D, and DS with G.) (The mean square
for Respondents within Group is the error term, or denominator mean
square, against which the mean square for Group is tested; the mean
square for Diet X Respondents within Group is the error mean square for
Diet, Sequence, and the remaining interaction mean square.) |
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| So far weve considered weight loss as the simple difference between
average pre-diet weight and average post-diet weight. But you migh wish
also to consider relative weight loss: that difference as a proportion
of pre-diet weight. Same structure and analysis, possibly different
results. Or use pre-diet weight as a covariate for the simple weight
loss as a response variable. There may also be interesting comparisons
to be made between the several pre-diet average weights; one can imagine
that these might differ depending on which diet preceded them, or on
their position in the temporal sequence. |
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| [I might have argued for a further 10 weeks of non-diet, with another
weighing at the end of it; but that would depend on whether your
interest be only in the weight loss attributable to a particular diet,
or to the persistence of that loss after one has stopped dieting.] |
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