Researchers have different opinions on sample size that is appropriate for surveys. Key question that keep emerging relates to the key requirements that may guide the sample size determination for purpose of piloting
The minimum number for a pilot study is 10 (Fink, 2003b as cited in Saunders et al., 2007).
Reference
Saunders, M.N., 2007. Research methods for business students, 5/e. Pearson Education India.
I do 10% but must admit that this is not informed by any literature.
Yes .. that's where the problem lies...that is...is there a defendable rationale/criteria for the size and pilot target
Dear Dr. Phares Ochola ,
The following are among the main requirements for determining the sample size for experimental purposes: community size, number of variables, nature and type of research, statistical methods that will be used, etc.
Pl. follow this important article entitled: Estimating the sample size for a pilot randomised trial to minimise the overall trial sample size for the external pilot and main trial for a continuous outcome variable:
Article Estimating the sample size for a pilot randomised trial to m...
Before performing a survey, you should have a good idea of the total number of subjects that can ideally take part in your survey, and then you have to decide on the confidence level (usually 95%) and the acceptable error %.
Hope this link helps: https://www.surveymonkey.com/mp/sample-size-calculator/
For a pilot study, the sample size is not at all a question. Pilot study done to see feasibility or to get estimates for estimating sample size for main study when no prior studies have been done and no literature is available. The effect size,power and amount of type I error(alpha error) are the key aspects. If literature is available the depending on the outcome of interest we neeed estimates of Mean,or Proportion.
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