Skip to main content

Currently Skimming:

Appendix A: Adjustment of Intake Distributions Used in This Report
Pages 110-114

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 110...
... Because the data refer to adjacent days rather than to independent estimates of intake, there is a potential for loss of statistical power as a result of the design of data collection, because of possible correlation of food intake between days for a given person. Note: The data analyzed in this report are for nutrients ingested in foods.
From page 111...
... mean values of the logarithm of intakes for each of 3 days for each person. These were the basic working data sets for the analyses presented in this report.
From page 112...
... The results of ANOVAs carried out for the NFCS data sets are presented in Table A-2. For comparison, the observed SDs in the original logarithmically transformed data sets are presented as well as the 3-day SD derived as described above.
From page 113...
... An approach that was adopted might preserve some of the uniqueness of the original distribution while removing the effect of intraindividual variation. This approach is described by the following algorithm, which was applied to each interval of intake in the original transf ormed data set: Adjusted intake = (observed intake - mean intake)
From page 114...
... 1-day data 3-day data Transf orbed data Adjusted data Vitamin C ( mg/dav ) 1-day data 3-day data Transf orbed data Adjusted data 4,620 4, 690 7.8647 3, 160 73.1 72.6 3.7219 52.8 2,740 3, 340 7.916 2, 700 48.0 57.3 3.785 43.1 _ 7, 360 5, 065 0.8488 1,800 72.9 56.8 0.9789 34.8 6.60S 58.298 3.911 20.675 -G .


This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More information on Chapter Skim is available.