TY - JOUR T1 - On estimating betas that change JF - The Journal of Portfolio Management SP - 62 LP - 65 DO - 10.3905/jpm.1982.408894 VL - 9 IS - 1 AU - Michael Theobald Y1 - 1982/10/31 UR - https://pm-research.com/content/9/1/62.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -