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Functions for fitting and plotting SITAR (Super Imposition by Translation And Rotation) growth curve models. SITAR is a shape-invariant model with a regression B-spline mean curve and subject-specific random effects on both the measurement and age scales. The model was first described by Lindstrom (1995) doi:10.1002/sim.4780141807 and developed as the SITAR method by Cole et al (2010) doi:10.1093/ije/dyq115.
| github.com/statist7/sitar |
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