Comparison of models of fixed and mixed effects on the analysis of an experiment with mutant strains of cellulotic fungus Trichoderma viride

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Sarai G?mez
Verena Torres
Yoleisy Garc?a
Luis M. Fraga
Luc?a Sarduy
Lourdes L. Sav?n

Abstract

Two models of fixed effect and one mixed were used to compare models of fixed and mixed effects on the analysis of measurements repeated in time through an experiment with mutant strains of cellulotic fungus Trichoderma viride. The data processing was conducted with the statistical software Infostat Version 1 and SAS (2007) version 9.1.3. Multivariate analysis of variance (MANOVA) was conducted from the
results of the Pearson correlation matrix, an univariate analysis of variance (ANOVA), according to divided plot design and an analysis of variance using the mixed model (PROC MIXED of SAS with option Repeated). The strains and the sampling times were considered as fixed effects, and the experimental units (Erlenmeyer flasks) were considered as random effect (subjects). The selection criteria (Verosimilarity,
Akaike and Bayesiano) were taking into consideration for a better model adjustment. The interaction between sampling times and treatments (strains) was significant for P < 0.05 in both methods used. The results showed that the analysis with mixed models was more success, because it solves the failing of the basis hypothesis, solves the limitation of the multivariate analysis of variance and gives higher flexibility
and information when selecting the model of better fit. It also allows analyzing data bases in unbalanced designs.
Key words: repeated measurements, univariate analysis of variance, mixed model.

Article Details

How to Cite
G?mez, S., Torres, V., Garc?a, Y., Fraga, L. M., Sarduy, L., & Sav?n, L. L. (2012). Comparison of models of fixed and mixed effects on the analysis of an experiment with mutant strains of cellulotic fungus Trichoderma viride. Cuban Journal of Agricultural Science, 46(2). Retrieved from https://cjascience.com/index.php/CJAS/article/view/54
Section
Biomathematics
Author Biographies

Sarai G?mez

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

Verena Torres

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

Yoleisy Garc?a

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

Luis M. Fraga

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

Luc?a Sarduy

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

Lourdes L. Sav?n

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, Mayabeque, Cuba

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