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Milan Bouchet-Valat edited this page Oct 26, 2017 · 10 revisions

Design references:

SQL NULL on Wikipedia
Working with missing data in the Pandas manual
Missing Data Functionality in NumPy enhancement proposal, summary of discussions and wiki page (2011-2012)
Pandas 2 Missing data consistency design document
Missing Values in the SAS manual
Missing Values in R, Stata, SAS and SPSS on UCLA's IDRE website
Types of missing values (NullFlavor) in the Health Level 7 v3 standard.