Reject Date Arithmetic in a Condition

Review ask

As a clinical trial statistician or programmer, challenge anything in this benchmark: describe a problem in Comments, or propose a fix with the Edit button on any source file.

Task: Is this a specification error a study team could realistically make, and should the build stop on it rather than continue?
Inputs: Do they trigger the failure for the reason the summary gives?
Expected failure: Is this the right error, raised at the right point, and would it tell the programmer what to fix?

The other tabs beside Comments are background for assessment, not under review.

Summary

EditUnder reviewWhat this benchmark means

README.md

Goal: flag adverse events (AE) whose onset falls inside a 30-day post-treatment review window in REVIEWFL.

Input: collected adverse events with onset date (AESTDTC) and the end of treatment (TRTEDT).

Variables:

REVIEWFL would contain Y when the onset is no more than 30 days after treatment ended, otherwise N.

Note: the condition adds 30 days to the treatment end date instead of comparing named values, so the run is rejected before any data is read and no artifact is accepted.

How to fix

Carry the day count in its own column and compare the named value:

- name: WINDOWDY
  type: int
  label: Days from Treatment End to Onset
  derivation:
    date_diff:
      start: TRTEDT
      end: ASTDT
      unit: day
- name: REVIEWFL
  type: str
  label: Protocol Review Flag
  derivation:
    flag:
      condition: "WINDOWDY <= 30"
      false_value: "N"
      missing: "N"

Expected failure

Editthe run is rejected; no artifact is accepted

expected/error.yaml

phase: validation
condition: invalid_predicate
requirement: REQ-0188

expected/error.yaml

phase: validation
condition: invalid_predicate
spec_paths:
  - columns.REVIEWFL.derivation.flag.condition
requirement: REQ-0188
context:
  predicate: "ASTDT <= TRTEDT + 30"

YAML specification

1 spec file

spec.yaml

Edit48 lines

1schema_version: "1.0"2domain: ADAE3keys: [STUDYID, USUBJID, AESEQ]4input:5  AE:6    path: input/ae.csv7    types: {AESEQ: int, AESTDTC: date, TRTEDT: date}89output:10  path: adae.csv11  columns: [STUDYID, USUBJID, AESEQ, ASTDT, TRTEDT, REVIEWFL]1213columns:14  - name: STUDYID15    type: str16    label: Study Identifier17    derivation: AE.STUDYID1819  - name: USUBJID20    type: str21    label: Unique Subject Identifier22    derivation: AE.USUBJID2324  - name: AESEQ25    type: int26    label: Sequence Number27    derivation: AE.AESEQ2829  - name: ASTDT30    type: date31    label: Analysis Start Date32    derivation: AE.AESTDTC3334  - name: TRTEDT35    type: date36    label: Date of Last Exposure to Treatment37    derivation: AE.TRTEDT3839  # Intentionally invalid: a condition compares named values and cannot40  # do date arithmetic, so TRTEDT + 30 is refused.41  - name: REVIEWFL42    type: str43    label: Protocol Review Flag44    derivation:45      flag:46        condition: "ASTDT <= TRTEDT + 30"47        false_value: "N"48        missing: "N"

Inputs

Under review1 source file

input/ae.csv

Edit2 rows

input/ae.csv
STUDYID	USUBJID	AESEQ	AETERM	AESTDTC	TRTEDT
PILOT7		1	Headache	2025-03-10	2025-03-01
PILOT7		2	Nausea	2025-04-15	2025-03-01

Unexpected Output

Under reviewNo artifact is produced

No fixture files in this directory.

Shaded columns are derived— = missing value

Comments and assessment materials

Dataset Name	Variable Name	Variable Label	Type	Codelist/Controlled Terms	Computational Method	Origin
ADAE	STUDYID	Study Identifier	character		Copy value from AE.STUDYID.	Predecessor
ADAE	USUBJID	Unique Subject Identifier	character		Copy value from AE.USUBJID.	Predecessor
ADAE	AESEQ	Sequence Number	numeric		Copy value from AE.AESEQ.	Predecessor
ADAE	ASTDT	Analysis Start Date	numeric	ISO 8601	Copy value from AE.AESTDTC.	Predecessor
ADAE	TRTEDT	Date of Last Exposure to Treatment	numeric	ISO 8601	Copy value from AE.TRTEDT.	Predecessor
ADAE	REVIEWFL	Protocol Review Flag	character		"Y" when ASTDT <= TRTEDT + 30; "N" otherwise; "N" when the condition is unknown.	Derived

Version	Date	Author	Description
1.3	2026-09-29	yamaa docs build	Show study codelist names, external dictionaries, and ISO 8601 formats in variable rows; list the document's codelist values and metadata
1.2	2026-09-29	yamaa docs build	Classify ADaM copies from a declared input as Predecessor and recodes as Derived, and SDTM recodes of locally derived columns as Derived
1.1	2026-09-29	yamaa docs build	Resolve lookups into the donor record they select, and give every derivation shape a plain-language rule instead of its raw YAML
1.0		yamaa docs build	Initial generation from spec.yaml

How to fix

input/ae.csv

Comments

Mapping spec