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Spinal bone mineral density measurements (Fragments)

Fragments.Rd

Relative spinal bone mineral density (spnbmd) measurements on 261 North American adolescents. Each value is the difference in spnbmd taken on two consecutive visits, divided by the average. The age is the average age over the two visits.

Usage

Fragments

Format

Variables:

Y_f.i

spnbmd measurements of female subjects i=1,...,140

X_f.i

ages of the female subjects at time of measurements

Y_m.i

spnbmd measurements of male subjects i=1,...,113

X_m.i

ages of the male subjects at time of measurements

Source

http://web.stanford.edu/~hastie/ElemStatLearn/

References

Bachrach LK, Hastie T, Wang M-C, Narasimhan B, Marcus R. Bone Mineral Acquisition in Healthy Asian, Hispanic, Black and Caucasian Youth. A Longitudinal Study. J Clin Endocrinol Metab (1999) 84, 4702-12.