Stack Overflow
Q&A for professional and enthusiast programmers
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Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
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Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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Open Data
Q&A for developers and researchers interested in open data
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Computer Science
Q&A for students, researchers and practitioners of computer science
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Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
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