I am doing a research on the topic of swiss ball on unilateral neglect. I am using convenient sampling or you can say purposive sampling. But I am not taking a patient from a particular rehab center. I was trying to choose 150 patients in three groups. Is there any specific calculation of sample size. some of the members in panel telling that take 100 patient in each group. But as per incidence and prevalence of this symptoms following a stroke, i felt only 150 is enough. kindly provide some solution for this.

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