If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Flexible semiparametric analysis of longitudinal genetic studies by reduced rank smoothing

$48.00 plus tax (Refund Policy)

Download / Buy Article:


Summary.  In longitudinal genetic studies, investigators collect repeated measurements on a trait that changes with time along with genetic markers. For family‐based longitudinal studies, since repeated measurements are nested within subjects and subjects are nested within families, both the subject level and the measurement level correlations must be taken into account in the statistical analysis to achieve more accurate estimation. In such studies, the primary interests include testing for a quantitative trait locus effect, and estimating the age‐specific quantitative trait locus effect and residual polygenic heritability function. We propose flexible semiparametric models and their statistical estimation and hypothesis testing procedures for longitudinal genetic data. We employ penalized splines to estimate non‐parametric functions in the model. We find that misspecifying the baseline function or the genetic effect function in a parametric analysis may lead to a substantially inflated or highly conservative type I error rate on testing and large mean‐squared error on estimation. We apply the proposed approaches to examine age‐specific effects of genetic variants reported in a recent genomewide association study of blood pressure collected in the Framingham Heart Study.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1467-9876.2011.01016.x

Affiliations: 1: Columbia University, New York, USA 2: New York University, USA 3: Boston University, USA 4: Pennsylvania State University, University Park, USA

Publication date: January 1, 2012

Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more