Joanna Jeziorek

has a Masters degree in Computer Science and Econometrics from AGH University of Science and Technology in Kraków (2020). She is a web developer experienced in building web applications that integrate financial data, regression models, and AI solutions. Joanna has been part of the EdgarStat team for over 8 years.

Joined: April 30, 2026
Articles: 1

Financial Economics

Joanna Jeziorek
April 30, 2026

Weighted Least Squares (WLS) in EdgarStat

Ordinary Least Squares (OLS) assumes the variance of the error term is constant across all observations. In practice, financial data rarely behaves this way. Larger firms, higher-revenue years, or certain industries tend to produce more dispersed residuals than others. When this heteroskedasticity…

Weighted Least Squares (WLS) in EdgarStat

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