Two‐sample homogeneity testing: A procedure based on comparing distributions of interpoint distances

2019 ◽  
Vol 12 (3) ◽  
pp. 234-252
Author(s):  
Pablo Montero‐Manso ◽  
José A. Vilar
Keyword(s):  
Homogeneity Testing ◽  
Comparing Distributions ◽  
Sample Homogeneity

On within sample homogeneity testing using gamma-ray spectrometry

2012 ◽  
Vol 70 (9) ◽  
pp. 2144-2148 ◽  
Author(s):  
Rares Suvaila ◽  
Elena Stancu ◽  
Octavian Sima
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Homogeneity Testing ◽  
Sample Homogeneity

Polished homogeneity testing of Corning fused silica boules

1999 ◽  
Author(s):  
Andrew W. Fanning ◽  
Joseph F. Ellison ◽  
Daniel E. Green
Keyword(s):  
Fused Silica ◽  
Homogeneity Testing

scholarly journals Improving Outcomes for English Learners Through Technology: A Randomized Controlled Trial

AERA Open ◽  
2021 ◽  
Vol 7 ◽  
pp. 233285842110255
Author(s):  
David Harper ◽  
Anita R. Bowles ◽  
Lauren Amer ◽  
Nick B. Pandža ◽  
Jared A. Linck
Keyword(s):  
Randomized Controlled Trial ◽  
English Learners ◽  
Multilevel Models ◽  
Controlled Trial ◽  
Control Group ◽  
Randomized Controlled ◽  
K 12 ◽  
Support Students ◽  
Sample Homogeneity ◽  
Trial Intervention

English learners (ELs) in K–12 schools must acquire English while simultaneously mastering content knowledge. Educational technology may support students’ learning through the affordance of individualized language practice. The current randomized controlled trial intervention study examined the effects of Rosetta Stone Foundations software on English learning among middle school ELs. The study took place in Grades 6 to 8 of an urban U.S. school district ( N = 221). Predictors of interest included time of testing (pretest vs. posttest) and software usage, and covariates included grade level, sex, and attendance. Additionally, socioeconomic status and home language were accounted for due to sample homogeneity. Multilevel models indicated that treatment group students showed larger gains than control group students on oral/aural outcomes. These results indicate that the software intervention enables individualized practice that can produce proficiency-related gains over and above the typical classroom curriculum.

Introduction to Statistical Methods for Outlier Detection and Sample Homogeneity Assessment of Reference Materials and Proficiency Test Items

2021 ◽  
Author(s):  
Yi-Ting Chen ◽  
Keyword(s):  
Data Analysis ◽  
Outlier Detection ◽  
Reference Materials ◽  
Proficiency Test ◽  
Test Items ◽  
Homogeneity Assessment ◽  
Iso 13528 ◽  
Scope Of Application ◽  
Iso 5725 ◽  
Sample Homogeneity

Due to the homogeneity of the product or sample, it will affect whether it meets the scope of application and purpose. For example, the reference materials(RM) produced by the reference material producer(RMP), and the proficiency test items selected by the proficiency testing provider(PTP), in order to ensure the reference materials or proficiency test items have consistent characteristics or comparability, they should be proved to have certain homogeneity. However, before performing homogeneity assessment, it is necessary to measure the characteristic parameters of the reference materials or proficiency test items to obtain a sufficient number of measured values for data analysis, but there may be outliers in the measured values that may affect data analysis and interpretation of the results. Therefore, this article will refer to ASTM E178-16a:2016[1], ISO 5725-2:1994[2], ISO 13528:2015[3], etc., to introduce several outlier detection and homogeneity assessment methods, supplemented by case studies. Finally, this article will remind the precautions for the use of the method, so that readers can choose the appropriate method for use in the actual analysis.

Comparing Distributions

1998 ◽  
pp. 81-101
Author(s):  
Allan J. Rossman ◽  
Beth L. Chance
Keyword(s):  
Comparing Distributions

Sample homogeneity, Response skewness and acquiescence: A reply to feather

1981 ◽  
Vol 33 (1) ◽  
pp. 41-46 ◽  
Author(s):  
John Ray
Keyword(s):  
Sample Homogeneity

scholarly journals Thermoluminescence Detection of Irradiated Fruits and Vegetables: International Interlaboratory Trial

2003 ◽  
Vol 86 (5) ◽  
pp. 971-975 ◽  
Author(s):  
David C W Sanderson ◽  
Lorna A Carmichael ◽  
Saffron Fisk ◽  
P Christensen ◽  
H Delincée ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Fruits And Vegetables ◽  
Homogeneity Testing ◽  
Interlaboratory Trial ◽  
Wide Range ◽  
Valid Data ◽  
Material Homogeneity ◽  
Qualitative Classification

Abstract An international interlaboratory trial was conducted to validate thermoluminescence methods for detecting irradiated fruits and vegetables. Five products were used in this study. This paper presents the results from prestudy material, homogeneity testing, details of sample preparation, and participants' results. Prestudy results provided a basis for cross comparison of instruments in different laboratories. A wide range of sensitivities, reproducibilities, and signal-to-background ratios were observed. Homogeneity testing showed that the method can distinguish between nonirradiated and irradiated products, including those bleached with 100 J/cm2 artificial daylight, provided that sensitivity rejection criteria are rigorously applied. Blind results were returned by 9 participants in the form of first and second glow integrals and glow ratios for all samples and a qualitative classification for each product. Of the 387 results reported, 327 valid results were obtained from participants. Where valid data were obtained, correct qualitative identifications were made by participants in all cases. Participants' results and homogeneity testing both confirm the validity of the thermoluminescence method for detecting irradiated fruits and vegetables.

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