BMNBBone-Marrow Needle Biopsy
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Finally, the brand minus no-brand (BMNB) factor is constructed by subtracting the return of the no-brand portfolio from the return of the brand portfolio (BMNB = Brand Portfolio - No-Brand Portfolio).
To determine the sensitivity of returns to the brand factor or brand beta, we include the BMNB factor as an explanatory variable in a multiple regression along with the Fama-French factors, market beta, HML, SMB, and the momentum factor, UMD.