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Medientyp:
E-Artikel
Titel:
Long memory in the Portuguese stock market
Beteiligte:
Floros, Christos;
Jaffry, Shabbar;
Valle Lima, Goncalo
Erschienen:
Emerald, 2007
Erschienen in:
Studies in Economics and Finance, 24 (2007) 3, Seite 220-232
Sprache:
Englisch
DOI:
10.1108/10867370710817400
ISSN:
1086-7376
Entstehung:
Anmerkungen:
Beschreibung:
PurposeThis paper's aim is to test for the presence of fractional integration, or long memory, in the daily returns of the Portuguese stock market using autoregressive fractionally integrated moving average (ARFIMA), generalised autoregressive conditional heteroskedasticity (GARCH) and ARFIMA‐FIGARCH models.Design/methodology/approachThe data cover two periods: 4 January 1993‐13 January 2006 (full sample), and 1 February 2002‐13 January 2006 (that is, data are considered after the merger of the Portuguese Stock Exchange with Euronext).FindingsThe results from the full sample show strong evidence of long memory in stock returns. When data after the merger are considered, weaker evidence of long memory is found. It is concluded that the Portuguese stock market is more efficient after the merger with Euronext.Originality/valueThe findings of this paper are helpful to financial managers and investors dealing with Portuguese stock indices.