For example when your target sample was 400 subjects, among this sample 360 subjects met the inclusion and exclusion criteria for the study, therefore the new sample will be 360 subjects, does it required to calculate the attrition rate?
What is your research question? in any case I would probably do that.. Best wishes David Booth
My research question for the convenice sampling, Does it required to calcauate the attrition rate or not? Especially, if the total paitients were 400 subjects, and. 360 of them were met the inclusion and exclusion ceriteria, does it required to calcate the atttition rate or not?
Attrition rates usually refer to participants who drop out of a longitudinal research project. Instead, it sounds like you have simple case of setting inclusion criteria and removing potential participants who did not meet those criteria.
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