Interpreting Difference-in-Differences and Time-Series Evidence in ISO 9001 Quality Improvement

This letter requests clarification of difference-in-differences specification and inference, and of the treatment of dependence in monthly outcomes. It distinguishes incomplete statistical reporting from conditional concerns about analytical validity, while recognising the original authors' acknowledgement of limitations in attributing improvement to certification.

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Publication Details

Journal
International Journal for Quality in Health Care
Published
2026-11-05
DOI
https://doi.org/10.1093/intqhc/mzag183
Primary Topic
Healthcare Quality and Management
Type
article
Field-Weighted Citation Impact
0.00
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article

Interpreting Difference-in-Differences and Time-Series Evidence in ISO 9001 Quality Improvement

I Kadek Angga Raditya, Abel Tantowongso
International Journal for Quality in Health Care
Healthcare Quality and Management
article

Interpreting Difference-in-Differences and Time-Series Evidence in ISO 9001 Quality Improvement

I Kadek Angga Raditya, Abel Tantowongso
article en

Abstract

This letter requests clarification of difference-in-differences specification and inference, and of the treatment of dependence in monthly outcomes. It distinguishes incomplete statistical reporting from conditional concerns about analytical validity, while recognising the original authors' acknowledgement of limitations in attributing improvement to certification.

International Journal for Quality in Health Care
Udayana University (ID)
Openalex Percentile: Top 11%
Healthcare Quality and Management
DOISourceOpenAlex
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Interpreting Difference-in-Differences and Time-Series Evidence in ISO 9001 Quality Improvement — I Kadek Angga Raditya, Abel Tantowongso · International Journal for Quality in Health Care (2026) | TGRS Research Map | TGRS