Keywords
Maderas angiospermas
Homogeneidad de la muestra
representatividad de la muestra
Análisis de varianza
Transverse vibrations
Angiosperm woods
Sample homogeneity
Representativeness of the sample
Variance analysis
How to Cite
Abstract
The objective of the research was to carry out a repeatability and reproducibility study in representative samples of small wooden specimens from Spathodea campanulata, Fraxinus americana and Albizia Plurijuga. The experimental strategy assumes two stages. The first consisted of the analysis of the results of the frequencies measured in the three angiosperm species. Its objective was to validate the homogeneity and representativeness of the woods under study. The second stage was oriented to the study of the variations of the frequency results. Its objective was to build repeatability and reproducibility tables and their analysis of variance. A completely randomized and balanced design was prepared. The experimental unit consisted of three homogeneous groups of 40 test tubes of each species. For each species studied, crossover repeatability and reproducibility studies were carried out. The results indicate that for S. campanulata, 97.7% of the total variance is due to the instrument while 2.3% to differences between operators; for F. americana, 99.2% of the total variance is due to the instrument and 0.8% to differences between operators, while for A. plurijuga, 100% of the total variance is due to the instrument while there is no variability due to differences between operators.
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