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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.
| Suppose you are interested in differences in weight loss as a function of
the several diets. For each person, you have 3 weight-loss values,
being the difference between measurements at #1 and #3 above, between #5
and #7, and between #9 and #11. For conceptual simplicity, lets take
those as differences between the averaged values. (What _kind_ of
averages may also be up for grabs; the median of each set of 42 values
might be best, as being relatively uninfluenced by unexpected, and
perhaps unaccountable, extreme values for an individual.) These values
are in a Latin square structure that can be displayed thus: |
| Your personal weight-loss counselor will share with you many helpful
tricks
and tips to improve your TrimLife results and prepare your personal
program
based on the evaluation results. |
| 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.) |
|
What was your New Years Resolution? Was it to lose weight? For 7 out of 10
people it was!! Have you kept your promise to yourself or have you gotten sidetracked?
We want to share with you what has happened to us. And ask that you let us help
you make the year 2000 right with a new, healthier you. |
| 1. Pretest weight (42 readings, averaged)
2. 10 weeks of Diet A (or Diet B, or Diet C, in the other two groups)_
3. Post-diet weight #1 (42 readings, averaged)
4. 10 weeks of uncontrolled non-diet
5. New non-diet baseline weight #2 (42 readings, averaged)
6. 10 weeks of Diet B (or Diet C, or Diet A, respectively)
7. Post-diet weight #2 (42 readings, averaged)
8. 10 weeks of uncontrolled non-diet
9. New non-diet baseline weight #3 (42 readings, averaged)
10. 10 weeks of Diet C (or Diet A, or Diet B, respectively)
11. Post-diet weight #3 (42 readings, averaged) |
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