Econ Seminar - Spurious Factor Analysis
3:00pm - 4:30pm
LSK6045

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This paper draws parallels between the Principal Components Analysis of factorless high-dimensional nonstationary data and the classical spurious regression. We show that a few of the princpal components of such data absorbs nearly all the data variation. The corresponding scree plot suggests that the data contains a few factors, which is collaborated by the standard panel information criteria. Furthermore, the Dickey-Fuller tests of the unit root hypothesis applied to the estimated 'idiosyncratic terms' often reject, creating an impression that a few factors are responsible for most of the nonstationarity in the data. We warn empirical researchers of these peculiar effects and suggest to always compare the analysis in levels with that in differences.
Venue Opening Hour
2:45pm
Event Format
Speakers / Performers:
Prof. Alexei Onatski
Cambridge University
Language
English
Recommended For
Alumni
Faculty and staff
PG students
Contact

Julie tel: 2358 7621 / email: fnjuwong@ust.hk

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