Letter to editor: Why should we report the correlation coefficient or the variance of the score differences in

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HAERI MEHRIZI ALI ASGHAR; SADIGHI JILA

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Payesh Year:2023 | Volume: | Issue: Page(s): 653-655

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Information Journal Paper

Title

Letter to editor: Why should we report the correlation coefficient or the variance of the score differences in "beforeafter" intervention studies when the dependent variable is quantitative?

Author(s)

HAERI MEHRIZI ALI ASGHAR | SADIGHI JILA | Issue Writer Certificate

Keywords

Intervention design

sample size

correlation coefficient

Abstract

Dear Editor, sample size calculation is one of the most important steps in developing a plan for research projects/dissertations. The sample size affects the power of the study and also has economic implications for a research project. If the sample size would be less than the required level, the tests used to analyze the research data will not have adequate power. Also, if the sample size would be too many, it will cause a waste of resources. In this regard, it is suggested that researchers report the "correlation coefficient between the data before and after the intervention" in addition to the mean and standard deviation in a pre-and postintervention study with a quantitative dependent variable so that other researchers can refer to it and calculate the sample size of their study correctly.

Cites

Sample size calculation formula in "before-after" intervention studies with qualitative outcomes (Letter to editor)

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APA: Copy

HAERI MEHRIZI, ALI ASGHAR, & SADIGHI, JILA. (2023). Letter to editor: Why should we report the correlation coefficient or the variance of the score differences in "beforeafter" intervention studies when the dependent variable is quantitative?. PAYESH, 22(5 ), 653-655. SID. https://sid.ir/paper/1069426/en

Vancouver: Copy

HAERI MEHRIZI ALI ASGHAR, SADIGHI JILA. Letter to editor: Why should we report the correlation coefficient or the variance of the score differences in "beforeafter" intervention studies when the dependent variable is quantitative?. PAYESH[Internet]. 2023;22(5 ):653-655. Available from: https://sid.ir/paper/1069426/en

IEEE: Copy

ALI ASGHAR HAERI MEHRIZI, and JILA SADIGHI, “Letter to editor: Why should we report the correlation coefficient or the variance of the score differences in "beforeafter" intervention studies when the dependent variable is quantitative?,” PAYESH, vol. 22, no. 5 , pp. 653–655, 2023, [Online]. Available: https://sid.ir/paper/1069426/en

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