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Other Comments:
The article is relevant to many researchers. The authors can include the reference article for Dental Environment Stress (DES) scale given by Garbee et al.
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Competing interests:
None
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Invited by the author to review this article? :
No -
Have you previously published on this or a similar topic?:
Yes
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References:
Journal of Dental Education (In Press) -
Experience and credentials in the specific area of science:
I have conducted a study on stress related aspects among dental undergraduate and students, which has been accepted for publication in Journal of Dental Education
- How to cite: Rao R .appropriate title[Review of the article 'Effect of Varying Sample Size in Estimation of Coefficients of Internal Consistency ' by Raj S].WebmedCentral 2012;2(3):WMCRW00615
Previous Version:
Effect Of Varying Sample Size In Estimation Of Reliability Coefficients Of Internal Consistency
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Other Comments:
The article very informative and I congratulate the authors
I found that the article has the content
Explicit structuring would add to the quality of the paper
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Competing interests:
None
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Invited by the author to review this article? :
Yes -
Have you previously published on this or a similar topic?:
No
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References:
None -
Experience and credentials in the specific area of science:
Yes. Currently conducting a qualitative research in a hospital setting
- How to cite: Tikare S .Good content[Review of the article 'Effect of Varying Sample Size in Estimation of Coefficients of Internal Consistency ' by Raj S].WebmedCentral 2012;2(3):WMCRW00583
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Other Comments:
The paper presents interesting results and is relevant to many of us. The authors need to include the reference of the article by Garbee et al, which is the original article for Dental Environment Stress (DES) scale.
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Competing interests:
None
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Invited by the author to review this article? :
Yes -
Have you previously published on this or a similar topic?:
Yes
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References:
Journal of Dental Education (In Press) -
Experience and credentials in the specific area of science:
I have conducted a few studies on stress in dental set up and one of my articles has been accepted for publication in The Journal of Dental Education.
- How to cite: Rao R .Title is appropriate [Review of the article 'Effect of Varying Sample Size in Estimation of Coefficients of Internal Consistency ' by Raj S].WebmedCentral 2012;2(3):WMCRW00571
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Other Comments:
Would recommend making the article more structured, and put into sections:
ABSTRACT
INTRODUCTION
METHODS
RESULTS
CONCLUSIONS
DISCUSSION
REFERENCES
I found it hard to follow this paper because it left out the results, conclusions, and discussion sections. I think there is good content, but without structure it loses clarity. A small revision would add tremendously to this paper.
The topic is important, and these authors should be congratulated on their work.
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Competing interests:
no
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Invited by the author to review this article? :
No -
Have you previously published on this or a similar topic?:
Yes
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References:
None -
Experience and credentials in the specific area of science:
PhD in Behavioral Sciences and Biostatistics.
- How to cite: Heston T F.Structure[Review of the article 'Effect of Varying Sample Size in Estimation of Coefficients of Internal Consistency ' by Raj S].WebmedCentral 2012;2(2):WMCRW00511
Responded by Dr. Shivalingappa B Javali on 28 Feb 2011 05:08:37 AM
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Other Comments:
The authors had one wonderful idea: to assess how sample size influence internal consistency coefficients. I have some comments and encourage the authors to revise the article. That's why I have commented and why Webmedcentral exists!
First, probably unintentionally the authors stated “Reliability Coefficients Of Internal Consistency”. It is “coefficients of internal consistency reliability”.
Second, the authors stated “Precision of measurement is one of the major issues, which is frequently quantified by the reliability coefficients.” They failed to simply define reliability (like “…the degree to which an instrument is free from random error.”) and to state what types of reliability exist. Internal consistency reliability is one of the “weakest” reliability types. There are inter-rater, reproducibility and so on. The writing in the text is directed towards reliability, but it is not the reliability what is evaluated but internal consistency. Therefore, everywhere in the rest of the article “reliability” should be replaced whit “internal consistency reliability”.
Third, for instruments employing dichotomous response choices, the Kuder–Richardson formula 20 (KR-20) is to be calculated for internal consistency reliability.
Forth, “theta” and “omega” are now past! The accumulated research over years demonstrated that Cronbach’s alpha is the most robust coefficient.
Fifth, there are results in one table and one figure, but no text and no discussions. What have the authors concluded, how does sample size influence internal consistency coefficients?
All best,
For details see newer texts:
Quality of life Research 2001, 11:193-205.
Journal Clinical Epidemiology 2007, 60: 34-42.
Quality of life Research 2010; 19: 539-549.
BMC Medical Research Methodology 2010, 10:22.
Streiner, David L.; Norman, Geoffrey R. Health Measurement Scales: A Practical Guide to Their Development and Use. Edition: 4th, 2008
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Competing interests:
None
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Invited by the author to review this article? :
No -
Have you previously published on this or a similar topic?:
Yes
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References:
Stevanovic D. Some psychometric properties of the Pediatric Quality of Life Inventory? Version 4.0 Generic Core Scales (PedsQLTM) in the general Serbian population. Quality of life Research 2011 (in press). Stevanovic D. Serbian KINDL questionnaire for quality of life assessments in healthy children and adolescents: reproducibility and construct validity. Health and Quality of Life Outcomes 2009, 7:79 -
Experience and credentials in the specific area of science:
Psychometrics
- How to cite: Stevanovic D .Coefficients of internal consistency reliability[Review of the article 'Effect of Varying Sample Size in Estimation of Coefficients of Internal Consistency ' by Raj S].WebmedCentral 2012;2(2):WMCRW00504
Responded by Dr. Shivalingappa B Javali on 28 Feb 2011 05:08:27 AM
It is an very important topic and the refrence given below will add information to the general readers.
Sathian B, Sreedharan J, Baboo NS, Sharan K, Abhilash E S, Rajesh E. Relevance of Sample Size Determination in Medical Research. Nepal Journal of Epidemiology 2010; 1(1): 4-10.
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I am the editor of several medical journal, authored and coauthored more than 400 articles, calculated sample size for several research projects.