Document Detail

Targeted Local Support Vector Machine for Age-Dependent Classification.
MedLine Citation:
PMID:  25284918     Owner:  NLM     Status:  Publisher    
We develop methods to accurately predict whether pre-symptomatic individuals are at risk of a disease based on their various marker profiles, which offers an opportunity for early intervention well before definitive clinical diagnosis. For many diseases, existing clinical literature may suggest the risk of disease varies with some markers of biological and etiological importance, for example age. To identify effective prediction rules using nonparametric decision functions, standard statistical learning approaches treat markers with clear biological importance (e.g., age) and other markers without prior knowledge on disease etiology interchangeably as input variables. Therefore, these approaches may be inadequate in singling out and preserving the effects from the biologically important variables, especially in the presence of potential noise markers. Using age as an example of a salient marker to receive special care in the analysis, we propose a local smoothing large margin classifier implemented with support vector machine (SVM) to construct effective age-dependent classification rules. The method adaptively adjusts age effect and separately tunes age and other markers to achieve optimal performance. We derive the asymptotic risk bound of the local smoothing SVM, and perform extensive simulation studies to compare with standard approaches. We apply the proposed method to two studies of premanifest Huntington's disease (HD) subjects and controls to construct age-sensitive predictive scores for the risk of HD and risk of receiving HD diagnosis during the study period.
Tianle Chen; Yuanjia Wang; Huaihou Chen; Karen Marder; Donglin Zeng
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Publication Detail:
Journal Detail:
Title:  Journal of the American Statistical Association     Volume:  109     ISSN:  0162-1459     ISO Abbreviation:  J Am Stat Assoc     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-10-6     Completed Date:  -     Revised Date:  2014-10-7    
Medline Journal Info:
Nlm Unique ID:  01510020R     Medline TA:  J Am Stat Assoc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1174-1187     Citation Subset:  -    
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