What is the type of non-probability sampling (of qualitative research) best fits the Content analysis of online jobs advertisements ?

30 May 2020 0 2K Report

I am collecting online jobs advertisements (around 3000 posts so far) to obtain the frequency of certain words. Which category of non-probability sampling (purposive, snowball, self-collection, convenience...etc) does this process belong to?

And are 3000 posts enough to represent the frequency of a certain word in relation to a specific job title?

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