Data Journalism Reinventing Actuarial Reserving: How Modern Dataframes and Whittaker-Henderson Smoothing Are Replacing Excel in Insurance September 21, 2026 Raul Delapena Setiawan TL;DR: For decades, the foundational Chain-Ladder method for loss reserving has been tied to legacy spreadsheets or expensive proprietary software. By leveraging modern dataframe libraries like Polars alongside advanced non-parametric…
