sitar: Super Imposition by Translation and Rotation Growth Curve Analysis
Tim James Cole · 2014
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) and developed as the SITAR method by Cole et al (2010) .