Walter Chen on Muck Rack

Walter Chen

New York
As seen in: LinkedIn, Business Insider, Color Research & Application, Fox News, Nature, The Times of India, Entrepreneur, Future Internet, Inc., Lifehacker and
co-founder of @sacrainc, investor at goldenwok.com and chairman at @animalzco. previously co-founder at @idonethis.
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Articles

Lowering LDL-C with bempedoic acid in patients with complex clinical profiles: European experience and local cases

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By Vivencio Barrios, Walter Chen
| mims.com
LDL-cholesterol (LDL-C) is the main driver of atherosclerotic cardiovascular disease (ASCVD), yet LDL-C control in high-risk patients remains far from optimal.
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When Error Metrics Contradict: Clarifying RMSE and MAE in Machine Learning Evaluation

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By Walter Chen, Kieu Anh Nguyen
| preprints.org
Submitted: 30 January 2026 You are already at the latest version Root mean squared error (RMSE) and mean absolute error (MAE) are among the most widely used performance metrics in machine learning and scientific modeling. Although their mathematical relationship is well established, misunderstandings and misapplications of these metrics continue to appear in the literature.
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On the Mathematical Relationship Between RMSE and NSE Across Evaluation Scenarios

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By Walter Chen
| preprints.org
This version is not peer-reviewed. Submitted: 24 September 2025 Posted: 24 September 2025 You are already at the latest version Model evaluation metrics play a crucial role in hydrology, where accurate prediction of continuous variables such as streamflow and rainfall–runoff is essential for sustainable water resources management and climate resilience.
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