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  "Description": "Provides 'SAS'-style IF/ELSE chains, independent IF rules,\nand DELETE logic for 'data.table', enabling clinical\nprogrammers to express Study Data Tabulation Model (SDTM) and\nAnalysis Data Model (ADaM)-style derivations in familiar\nSAS-like syntax. Methods are informed by clinical data\nstandards described in CDISC SDTM and ADaM implementation\nguides. See <https://www.cdisc.org/standards/foundational/sdtm>\nand <https://www.cdisc.org/standards/foundational/adam>.",
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  "Encoding": "UTF-8",
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      "title": "SAS IF-style data step logic for data.table",
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      "title": "Create a SAS-style DELETE rule",
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      "title": "Create a SAS-style IF rule",
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      "headings": [
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        "Setup",
        "Scenario 1 — ADSL: Population Flags",
        "The Problem",
        "The sasif Solution",
        "Scenario 2 — ADSL: Multi-Arm Treatment Assignment (IF / ELSE IF / ELSE)",
        "Scenario 3 — ADSL: Age Categorisation",
        "Scenario 4 — ADLB: Laboratory Value Categorisation",
        "Scenario 5 — ADAE: Treatment-Emergent Flag (TRTEMFL)",
        "Scenario 6 — DELETE: Remove Unwanted Records",
        "Scenario 7 — Independent Flags (if_independent)",
        "Key Principle: When to Use Which Function",
        "Summary"
      ],
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