A serial homogeneity test based on Indonesian Standard SNI 8506:2018 were undertaken to investigate 12 manufactured collimators by using double wall single image radiography (DWSI) technique with an x-ray machine ranging from 120 150 kV. The standard stated that the film density should be measured seven different points, and result obtained must not exceed ± 0.05 average density. This paper out...

the aim of this study was to evaluate the utility of a proficiency testing program among limited number of local laboratories as an alternative to the iupac/citac guide on proficiency testing with a limited number of participants, specially where international schemes are not accessible. as a sample scheme we planned to determine aflatoxins (b1, g1, b2, g2, total) in iranian pistachio matrix. a...

We modeled and applied Stochastic COntext Tree (SCOT) for statistical inference about financial, literary and seismological stationary strings. We analyzed several models viewed as simplified approaches to financial modeling: evaluate their stationary distribution, entropy rate and convergence to the Brownian motion. We also estimated the SCOT parameters and tested homogeneity of data strings u...

This paper compares empirical type I error and power of different tests that have been proposed to assess the homogeneity of within-group variances, prior to anova. The tests of homogeneity of variance (THV) compared in this study are: Bartlett's test, the Scheffé-Box log-anova test, Cochran’s C test and Box’s M test, in their parametric and permutational forms. The main questions addressed in ...