Modelling of covariances of Sarda ewe milk test day records
[The mixed model has been profitably applied in the analysis of repeated measures. For periodic records of milk yield the power of analysis can be raised if the ability of the model to adequately structurate the pattern of (co)variances associated with random effects. In particular, an autoregressiv...
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Published in | Proceedings of the ASPA Congress - Recent Progress in Animal Production Science (Italy) Vol. 1 |
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Main Authors | , , , |
Format | Conference Proceeding |
Language | English |
Published |
1999
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Subjects | |
Online Access | Get more information |
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Summary: | [The mixed model has been profitably applied in the analysis of repeated measures. For periodic records of milk yield the power of analysis can be raised if the ability of the model to adequately structurate the pattern of (co)variances associated with random effects. In particular, an autoregressive model, assuming that covariance between pairs of records within the same lactation is linked to proximity of time, has been applied]
Il modello misto e' stato applicato proficuamente nell'analisi di misure ripetute. Nel caso dei rilievi periodici della produzione lattea la potenza dell'analisi puo' essere aumentata, se si utilizza la capacita' del modello di strutturare adeguatamente le varianze-covarianze indotte dai fattori casuali. In particolare, si e' applicato un modello autoregressivo che tiene conto del fatto che la covarianza tra coppie di misure nell'ambito della stessa lattazione e' legata alla loro distanza temporale |
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Bibliography: | 2001061862 L10 L01 |