I have found two interesting publications about the required skills and tools for Data Analyst, Data Scientist, Data Engineer, and Machine Learning Engineer positions. They collected skill lists for each position scratching multiple job advertisements for months and used AI (ML) to extract data and also for data clustering.
The required skill lists have nothing surprising, but I found elegant the way they did it.
One important finding is that sometimes the companies do not know which type of skills they need for their planned project, those who are frequently confused on the applicant side, as well.
The studies compare the positions from different aspects, and also the advertising companies (type, size, place, etc.).
They shared the code that they used to gain the data (website scratching and other).
One of their well organized graphs is clustering the skills and positions.
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