"Central to both the theoretical and the empirical validity of factor models is the correct specification of the number of factors."
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Original Language: English
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Jushan Bai and Serena Ng. "Determining the number of factors in approximate factor models." Econometrica 70.1 (2002): 191-221.
https://en.wikiquote.org/wiki/Jushan_Bai
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Jushan Bai
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