If you want to estimate a sample size for a qualitative research in an unknown population, what is the suitable statistical model to use?
I would like to see others who might be more expert in qualitative research address this, and I will eagerly read the answers. But to start the ball rolling, for me, as qualitative research does not, in general, set inference as a goal, estimation of sample size for the purpose of generalization to a population, known or unknown, seems irrelevant. That is, the sample size needed would be judged on other grounds, perhaps estimated likelihood of answer saturation.
Umar M. Modibbo You may check this paper that proposed some new ideas Article A Frequentist Alternative to Significance Testing, p-Values,...
Determination of the sample size in known or unknown populations in qualitative research may decide based on the quality of data (how data saturation can achieve) not the number of informants.
According to Saunders et al. (2012), number of informants may vary between 5 - 25 in a qualitative study. Also, theoretical sampling is much important as we recruit informants based on their expertise, knowledge, and experience.
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