First draft article on Heteroskedasticity

[MatthijstenTije]

• Discusses heteroskedasticity, covering its definition, exploration through graphical tests, and methods for detection and correction.
• Includes references to Valerie's draft on serial correlation, which therefore must be published prior to this article.

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[alexandervossen]

Thanks for the draft! Looks good! Below a few commments:

Heteroskedasticity is a common issue in time series and panel data analysis <- ot only in panel data also for cross-sectional analysis. One main culrpit here, in my understanding, is skewed distributions of observations. I see you discuss many of the reasons at the very end- maybe its worthwhile to move those things to the opening section? Otherwhise great! And I learned how to do a BP test by hand :)