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1/6/2009
Tuesday morning
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This site is for our clients only as an information resource.
| 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. |
| 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!! |
| As above, weights were taken in the 10th week. All of the panelists
were then given 10 weeks off to go back to their original (non-trial) diet
and weighed themselves as above before starting a new diet. In the final
10-week period, the panelists went on the Diet they had not tried before. |
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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.) |
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