Best Practices for Effective Data Visualization

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1. 12 July 2026 · corrected by Melik Can Sariyer

   2 corrections applied: Chronology reversed: the mortality drop happened in 1855 during the war (after Scutari sanitary reforms), before Nightingale's 1858 diagram presentation, not within two years after it. | Polar-area/rose charts had earlier precedents; Nightingale developed and popularized her version rather than strictly inventing the form.

   Before

   Within two years of her presentation, sanitary reforms had reduced the death rate... a polar area chart she unverified specifically for this purpose

   After

   Sanitary reforms during the war had reduced the death rate in military hospitals from 42% to 2%, the very results her later presentation drew on... a polar area chart she developed and popularized for this purpose

   Why: Corrected the chronology (the mortality drop occurred during the war, before Nightingale's 1858 presentation, not within two years after it) and corrected the claim that Nightingale unverified the polar-area/rose chart form outright; she developed and popularized her version of a pre-existing chart type. Verified fully applied in body, no stale mentions remain.

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