When people say things such as 80% of marijuana purchases are on the black market, how are they getting data for this?
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You know, I actually posted another comment, but I wanted to come at this from a different angle. It depends on what you mean by *they*. Now, on one hand, they might get the data in all the ways that you see in this thread – data is collected at bunches of little sources at the granular level (a single school, a single restaurant, a single laboratory, etc.), then people above them aggregate the data from bunches of single sources (aggregate meaning they pull all the data together, clean it up, and turn it into one data set) – this might be a whole school district, the corporate of a restaurant, etc. This might also happen on a larger scale; for instance, the WHO or the World Bank might collect already-aggregated data sets and combine those to form massive, international data sets.
But! If you mean *they* as in the people who use the data, *you* can personally get data from all kinds of different places. For instance, I recently did an analysis of global suicide rates. I got this data off of a website called Kaggle. The person who posted the data had aggregated it from like four different sources. You can download data, usually for free, from places like the WHO, the World Bank, Kaggle, and tons of other places.
EDIT: Spelling.
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