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Logo of gseBioMed CentralBiomed Central Web Sitesearchsubmit a manuscriptregisterthis articleGenetics, Selection, Evolution : GSEJournal Front Page
Genet Sel Evol. 2007; 39(3): 249–265.
Published online Apr 14, 2007. doi:  10.1186/1297-9686-39-3-249
PMCID: PMC2682825
A periodic analysis of longitudinal binary responses: a case study of clinical mastitis in Norwegian Red cows
Yu-mei Chang,corresponding author1 Daniel Gianola,1,2 Bjørg Heringstad,2,3 and Gunnar Klemetsdal2
1Department of Dairy Science, University of Wisconsin, Madison, USA
2Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences
3Geno Breeding and A. I. Association, Norway
corresponding authorCorresponding author.
Yu-mei Chang: y.chang/at/
Received February 14, 2006; Accepted December 6, 2006.
A Bayesian procedure for analyzing longitudinal binary responses using a periodic cosine function was developed. It was assumed that, after adjustment for "seasonal" effects, the oscillation of the underlying latent variables for longitudinal binary responses was a stationary series. Based on this assumption, a single dimension sinusoidal analysis of longitudinal binary responses using the Gibbs sampling and Metropolis algorithms was implemented in a study of clinical mastitis records of Norwegian Red cows taken over five lactations.
Keywords: clinical mastitis, periodic analysis, sinusoidal analysis, threshold model
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