Reject Formula Flag

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: derive AVAL, ANRHI, and HIFL for each subject and parameter, flagging collected laboratory results that lie above their reference range.

Input: collected laboratory records carrying the study and subject identifiers with LBTESTCD, the test code; LBSTRESN, the numeric result; and LBSTNRHI, the upper limit of its reference range.

Variables:

AVAL would be the collected result, taken from LBSTRESN.
ANRHI would be the upper limit of the reference range, taken from LBSTNRHI.
HIFL would be 1 for a result above that limit and 0 otherwise.

Note: the flag is written as the comparison AVAL > ANRHI inside a formula. A formula produces a number, while a comparison answers yes or no; turning that answer into 1 or 0, or into text, would each be a different result from the same comparison, so the run is rejected before any data is read and no artifact is accepted. HIFL is this benchmark's own invention, documented here; AVAL and ANRHI follow ADaMIG-1.3.

How to fix

Ask the comparison where the flag is decided, so the conversion from a yes-or-no answer to 1 or 0 is explicit:

- name: HIFL
  type: int
  derivation:
    case:
      - when: "AVAL > ANRHI"
        then: {literal: 1}
      - otherwise: {literal: 0}

A missing result or limit answers neither yes nor no, so it falls to otherwise and gets 0; to leave such a flag empty instead, replace the otherwise with when: "AVAL <= ANRHI" returning 0.

Expected failure

Editthe run is rejected; no artifact is accepted

expected/error.yaml

phase: validation
condition: prohibited_construct
requirement: REQ-0441

expected/error.yaml

phase: validation
condition: prohibited_construct
spec_paths:
  - columns.HIFL.derivation.compute.expr
requirement: REQ-0441
context:
  expr: "AVAL > ANRHI"
  construct: comparison

YAML specification

1 spec file

spec.yaml

Edit45 lines

1schema_version: "1.0"2domain: ADLB3keys: [STUDYID, USUBJID, PARAMCD]4input:5  LB: input/lb.csv67output:8  path: adlb.csv9  columns: [STUDYID, USUBJID, PARAMCD, AVAL, ANRHI, HIFL]1011columns:12  - name: STUDYID13    type: str14    label: Study Identifier15    derivation: LB.STUDYID1617  - name: USUBJID18    type: str19    label: Unique Subject Identifier20    derivation: LB.USUBJID2122  - name: PARAMCD23    type: str24    label: Parameter Code25    derivation: LB.LBTESTCD2627  - name: AVAL28    type: float29    label: Analysis Value30    derivation: LB.LBSTRESN3132  - name: ANRHI33    type: float34    label: Analysis Normal Range Upper Limit35    derivation: LB.LBSTNRHI3637  # A formula admits no comparison: a yes-or-no question belongs in a case,38  # which states how the answer becomes 1 or 0. The specification is39  # rejected before any data is read.40  - name: HIFL41    type: int42    label: High Result Flag43    derivation:44      compute:45        expr: "AVAL > ANRHI"

Inputs

Under review1 source file

input/lb.csv

Edit2 rows

input/lb.csv
STUDYID	USUBJID	LBTESTCD	LBSTRESN	LBSTNRHI
YAMAA-01		ALT	42	35
YAMAA-01		ALT	20	35

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	Computational Method	Origin
ADLB	STUDYID	Study Identifier	character	Copy value from LB.STUDYID.	Predecessor
ADLB	USUBJID	Unique Subject Identifier	character	Copy value from LB.USUBJID.	Predecessor
ADLB	PARAMCD	Parameter Code	character	Copy value from LB.LBTESTCD.	Predecessor
ADLB	AVAL	Analysis Value	numeric	Copy value from LB.LBSTRESN.	Predecessor
ADLB	ANRHI	Analysis Normal Range Upper Limit	numeric	Copy value from LB.LBSTNRHI.	Predecessor
ADLB	HIFL	High Result Flag	numeric	Compute AVAL > ANRHI.	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/lb.csv

Comments

Mapping spec