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1/5/2009
Monday morning
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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: |
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way,
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| 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.) |
| Ive lost weight in the past only to gain it back and more. Not until Ive found
something incredible have I been able to keep the weight off. To give you an example,
I lost 7 pounds in 7 days and went on for another 2 months to lose another 23 pounds.
My friend and his wife lost a combined 140 pounds in just 4 1/2 months and they have kept
it off for over 2 1/2 years. He went from a 36 to a 30 waist and his wife
went from a size 16 to a size 6. We lost our weight while still enjoying the
foods that we normally ate without counting a calorie and with no exercise.
We werent tired or hungry. Our energy shot through the roof and our bodies were
turned into major fat burning machines. Its INCREDIBLE!! |
| 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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