MULTIVARIATE ANALYSIS OF REPEATED MEASURES DATA
Keywords:
Repeated measures, ANOVA, MANOVA, Profile analysis, Non-parametric, Multiple sample.Abstract
In this paper, we have used SAS software for the multivariate analysis of repeated measures data due to Grizzel and Allen (1969). We have applied four multivariate methods viz MANOVA, Profile Analysis, non-parametric multisample rank sum test and non-parametric multisample median test to analyse two sets of data. The findings of the study reveal that profile analysis gives similar results as revealed by MANOVA, except in case of Pillai’s trace and Hotelling-Lowley’s trace statistics where time*group effects were found insignificant. Non- parametric analysis of the same data revealed different conclusions.
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References
Cole, J. W. L. and Grizzle, J. E. (1966). Applications of multivariate analysis
of variance to repeated measurement experiments, Biometrics, 22, p. 810-828.
Grizzle, J. E. and Allen, D. M. (1969). Analysis of growth and dose response
curves, Biometrics, 25, p. 357-381.
Khatri, C. G. (1966). A note on a MANOVA model applied to problems in
growth curves, Annals of the Institute of Statistical Mathematics, 18, p. 75-86.
Mendes, M., Dincer, E. and Arslan, E. (2007). Profile analysis and growth
curve for body mass index of broiler chickens reared under different feed
restrictions in early age, Arch. Tierz, Dummerstorf, 50(4), p. 403-411.
Naik, D. N. and Rao, S. S. (2001). Analysis of multivariate repeated measures
data with a kronecker product structured covariance matrix, Journal of Applied
Statistics, 28, p. 91-105.
Rao, C. R. (1966). Covariance adjustments and related problems in
multivariate analysis, In Krishmaiah, P. R., Editor, Multivariate Analysis, p.
-103, Academic Press, New York.
Tiwari, P. And Shukla, G. (2011). Approach of linear mixed model in
longitudinal data analysis using SAS, Journal of Reliability and Statistical Studies;
(1), p. 73-84.
Wang, Z., Nkrumah, J. D., Li C., Basarab, J. A., Goonewardene, L. A., Okine,
E. K., Crews, D. H., Jr. and Moore, S. S. (2006). Test duration for growth,
feed intake and feed efficiency in beef cattle using the GrowSafe system,
Journal of Animal Science, 84, p. 2289-2298.
