Relative spinal bone mineral density measurements on 261 North American adolescents. Each value is the difference in mineral density taken on two consecutive visits, divided by the average. The age is the average age over the two visits.
formatFuncy): A matrix of dimension 261x3.
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Gareth M. James and Catherine A. Sugar. Clustering for Sparsely Sampled Functional Data . Journal of the American Statistical Assocation. 98. 397–408. 2003
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