Hello dear colleagues,
what is the appropriate method for calculating the sample size of a retrospective study?
I am developing a study that considers the last 10 years of patient health care, population value 832.660, but I have doubts about the sample calculation method considering that this is an observational research.
I appreciate your suggestion.
In such a case, you need to know the whole population means of traits related, then you take different size samples and compare all means of all traits studied with those of the population, the results of comparons will give you the best sample size according to the statistical test used. Regards.
Just use all the data in the entire population. Sampling will simply introduce another source of error. Best wishes David Booth
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