## Estimating Modifying Effect of Age on Genetic and Environmental Variance Components in Twin Models.

- Liang He, Mikko J Sillanpää, Karri Silventoinen, Jaakko Kaprio, Janne Pitkäniemi
- Genetics
- 2016

Highly Influenced

4 Excerpts

- Published 2013

This paper proposes a numerically simple routine for locally adaptive smoothing. The locally heterogeneous regression function is modelled as a penalized spline with a smoothly varying smoothing parameter modelled as another penalized spline. This is being formulated as hierarchical mixed model, with spline coefficients following a normal distribution, which by itself has a smooth structure over the variances. The modelling exercise is in line with Baladandayuthapani, Mallick & Carroll (2005) or Crainiceanu, Ruppert & Carroll (2006). But in contrast to these papers Laplace’s method is used for estimation based on the marginal likelihood. This is numerically simple and fast and provides satisfactory results quickly. We also extend the idea to spatial smoothing and smoothing in the presence of non normal response.

@inproceedings{Krivobokova2013FastAP,
title={Fast Adaptive Penalized Splines},
author={Tatyana Krivobokova and Ciprian M. Crainiceanu and Goran Kauermann and G{\"{o}ran Kauermann},
year={2013}
}