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Questions related from Ehab Mudher Mikhael
Can I know how to perform comparison between 2 groups (intervention vs control) for a parameter which obtained at 0, 3 and 6 months (3 readings) and the data is abnormally distributed?
03 March 2020 5,968 3 View
I made an interventional study, with 2 groups control and intervention group, with measurement at baseline, after 3 months and 6 months, what is the best statistical test to evaluate if the...
03 March 2020 7,442 4 View
Can a researcher get higher than the desired sample size in one arm of the study? Example if the sample size is 60 patients (30 in each arm) and one assumes 30% loss to follow up with a total of...
10 October 2019 8,301 6 View
can we calculate sample size in clinical trials based on history by using the mean data (mean improvement and mean SD) for a number of studies ? or it must be obtained from one study? Please if...
10 October 2019 5,460 4 View
If previous studies showed a reduction of 0.71% in Hba1c (SD = 0.55) in inetrvention group and 0.25% (SD=0.47) in control group what will be the required sample size for this study to achieve 0.05...
07 July 2018 914 15 View
I just read news on medscape and found the following status: The research team is hoping to start trials of a plasminogen activator inhibitor 1 (PAI-1), TM5614, to examine its effects on insulin...
11 November 2017 8,593 5 View
Is there a reliability test other than cronbach alpha if answers to questionnaire questions with yes or no ?
10 October 2017 1,756 5 View
If someone structured a new questionnaire in arabic and did a pilot study on arabic people, but to publish the article an english version of the questionnaire is needed, then is there a need to do...
09 September 2017 8,662 7 View
How to calculate sample size if the study is proposed to be done in multiple phases, phase 1 qualitative study, phase 2 cross sectional study and phase 3 clinical trial? can we take 1 sample size...
08 August 2017 2,202 6 View
How to measure prevalence of patient quality of life and response rate to disease modifying treatment (they are more than one) to use this prevalence in measuring sample size??
04 April 2017 2,699 2 View
Is there any formula or calculator for measuring sample size in rare disease? especially if the researcher work in a medical center for this rare disease with nearly half of country cases
04 April 2017 4,329 18 View
What is the method for data input and analysis (test name) for test retest reliability using SPSS program?
12 December 2016 7,416 7 View
Is there any hints for getting a scholarship in pharmacy practice from high reputation Universities?
10 October 2016 5,245 1 View
What is the best statistical test and what parameter in that test, is used to remove the effect of multiple factors on 1 variable and maintain just 1 factor?
09 September 2016 5,766 4 View
I ask about a diabetes journal with rapidly processing manuscripts that has an ISI impact factor and pubmed indexing.
09 September 2015 9,723 0 View
If a questionnaire item with corrected item total correlation below 0.2 and it should be deleted from final version of the questionnaire, then how we can do concurrent validation? 1. Is it more...
01 January 1970 7,101 2 View
How to calculate the effect size for clinical trial sample size calculation? and how to calculate the standard deviation in cases of educational interventions for diabetic patients with hba1c as...
01 January 1970 9,735 5 View
How to insert negative data using SPSS? since SPSS consider all negative values (e.g., -1,-2,...) as missing values
01 January 1970 4,024 10 View
