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| access group | A named group of users that can be [authorized](Authentication-and-Authorization) for specific actions. |
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| access group | A named group of users that can be [authorized](Authentication-and-Authorization) for specific actions. Also called a "role" in the system. |
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| blending | The combination of several data sets into a single, larger data set. |
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| cell | The intersection of a column and a row, usable to store a single piece of data associated with a single participant. |
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| column | A data structuring primitive associated with a single type of data, or with a single measurement. Columns are referred to by their names. |
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| polymorphic pseudonym (PP) | A row identifier that is partially randomized. While any PP refers to a single row, a row is not uniquely associated with a single PP. |
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| pseudonym | An identifier that uniquely denotes data, but is not otherwise associated with a real-world entity. Pseudonyms are applied to allow data manipulation without needing to divulge sensitive (e.g. personally identifying) information. |
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| [pseudonymization](Pseudonymization) | The application of pseudonyms to data, making it difficult or impossible to associate information with a particular person or real-world entity. |
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| role | Synonym for "access group". |
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| row | A data structuring primitive associated with a single entity or data subject. Rows are referred to by their identifiers. |
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| [short pseudonym](https://gitlab.pep.cs.ru.nl/pep-public/user-docs/-/wikis/Pseudonymization#short-pseudonyms) (SP) | An identifier for a piece of data not stored in PEP. Usually these are non-digital specimens such as biosamples taken during medical research. The identifier is stored in PEP, allowing the external specimen to be associated with the PEP row. |
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| table | The conceptual structure of PEP's storage, in which rows refer to data entries (participants or subjects) and columns to different types of data (or separate measurements). |
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