Economist Estelle Bee Dagum passed away on April 2, 2026, at the age of 91. Introduction Estelle Bee Dagum was an Argentine and later also Canadian economist and statistician, known for her influential work in the field of time series analysis and seasonal adjustment. Her passing is noted because her methods have been used for decades by statistical agencies, central banks, and researchers worldwide. In particular, her contribution to the X-11-ARIMA method remains of lasting significance for the analysis of economic data. Career and Achievements Dagum earned her degree in 1957 from the National University of Córdoba and completed her PhD in economics there in 1960. During that period, she was among the few women in Argentina to obtain a doctorate in this field. Starting in 1972, she worked at Statistics Canada, where she played a key role in the development and modernization of statistical methods. During her career, she also acquired Canadian nationality, in addition to her Argentine background. She gained international recognition through her research in time series analysis. Dagum developed the X-11-ARIMA method for seasonal adjustment, a technique widely adopted by statistical agencies around the world. This approach integrated ARIMA models into existing procedures, enabling more accurate estimates and better corrections for seasonal effects. Her work helped governments and policymakers interpret economic indicators such as production, retail trade, and employment. Additionally, she was a pioneer in applying computer technology to time series analysis in the 1970s and 1980s. Throughout her career, she published more than 100 scientific articles in journals, exerting broad influence on both economics and statistics. In 1997, Dagum joined the University of Bologna, where she became a 'chiara fama' professor in statistical sciences. There, she continued her research and mentored new generations of scholars. Her most well-known works include the following books: Benchmarking, Temporal Distribution, and Reconciliation Methods for Time Series (2006) Seasonal Adjustment Methods and Real Time Trend-Cycle Estimation (2016) These publications brought together decades of methodological expertise. Her work on benchmarking, temporal distribution, and aligning data series became important for statisticians working with different measurement levels and incomplete data. Private Life Little is publicly known about Estelle Bee Dagum’s private life. It is known that she was originally from Argentina and later also acquired Canadian nationality. No further confirmed details about her family or personal circumstances have been made public. Therefore, this information remains private. Passing Estelle Bee Dagum died on April 2, 2026, at the age of 91. The place of death has not been publicly confirmed. No public information about the cause of death has been released. Her passing garnered attention due to her significant contributions to statistical sciences and the economic analysis of time series. Conclusion With the death of Estelle Bee Dagum, the field of statistics loses an innovative and internationally influential researcher. Her methods for seasonal adjustment and time series analysis continue to be of great value to economists, statisticians, and public institutions. Her legacy lives on in the daily practices of statistical agencies and in academic research building upon her work. On Overleden.net, you can find more notable scientists who have passed away. This article was prepared with the support of AI tools and verified by the editorial team of Overleden.net.