Description Usage Format Source Examples
The femSBMD
data frame has longitudinal data on spinal bone mineral, density, age and ethnicity for female youths from a study on bone mineral acquisition.
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This data frame contains the following columns:
idnum
identification number unique to each subject.
spnbmd
spinal bone mineral density in grams per square centimeter.
age
age of subject in years.
ethnicity
factor corresponding to the subject's
ethnicity with levels Asian
, Black
, Hispanic
and White
.
black
indicator of the subject being black:
0 = subject is black
1 = subject is not black.
hispanic
indicator of the subject being Hispanic:
0 = subject is Hispanic
1 = subject is not Hispanic.
white
indicator of the subject being white:
0 = subject is white
1 = subject is not white.
Bachrach, L.K., Hastie, T., Wang, M.-C., Narasimhan, B. and Marcus, R. (1999). Bone mineral acquisition in healthy Asian, Hispanic, Black, and Caucasian youth: a longitudinal study. Journal of Clinical Endocrinology and Metabolism, 84, 4702-4712.
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