Research methodology and research protocol development / Course files

Sampling and sample size estimation

Moazzam Ali

Training course in research methodology and research protocol development 2019

December 9, 2019 - Geneva

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Ali M. Sampling and sample size estimation. Paper presented at: Training course in research methodology and research protocol development; 2019 Dec 9; Geneva.

Tasks

• Go over the presentation: Sampling and sample size estimation - Moazzam Ali (WHO).
• Go over the presentation: Quantitative data collection: Designing a questionnaire - Khalifa Elmusharaf (University of Limerick, Ireland).
• Study section 4.6 ‘Study sample’, 4.7 ‘Sample size’ and 4.8 ‘Measurement’ on pages 50 to 55 of the document: Fathalla MF, Fathalla MM. A practical guide for health researchers (WHO Regional Publications, Eastern Mediterranean. Series 30). WHO; 2004.

Relevant online resources

• Jenn NC. Designing a questionnaire. Malays Fam Physician. 2006 Apr 30;1(1):32-5.

Tools for sample size estimation

• Epi Info™. Centers for Disease Control and Prevention (CDC) (See also Epi Info™ 7 Tutorial Videos)
• STEPS Sample Size Calculator and Sampling Spreadsheet

Reference document

• Fathalla MF, Fathalla MM. A practical guide for health researchers (WHO Regional Publications, Eastern Mediterranean. Series 30). WHO; 2004.

Assignment

1. Go over the cross-sectional study Nguyen and Budiharsana, 2012 from Week 4 and respond to the following questions:

1.1. Who were the target and study populations?

1.2. What was the sample unit in this study?

1.3. Identify and give a brief description of the sampling method.  

1.4. Which instrument was used to collect data?

2. If you are designing a quantitative study for your research topic,

2.1. What sampling technique do you propose for your study?

2.2. What is your proposed sample size?

2.3. Which data collection tool would you use?