The seasonal adjustment of quarterly service turnover indices

Barbara Iaconelli (), Fabio Bacchini, Maria Giulia Ippoliti (), Barbara Guardabascio and Roberto Iannaccone ()
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Barbara Iaconelli: Italian National Institute of Statistics
Maria Giulia Ippoliti: Italian National Institute of Statistics
Roberto Iannaccone: Italian National Institute of Statistics

Rivista di statistica ufficiale, 2015, vol. 17, issue 1, 55-78

Abstract: In the last years Istat has increased information in the short-term statistics domain for the ser- vice sector. Until 2010 quarterly service turnover indices were published only in unadjusted form. The time span available made the estimation of seasonally adjusted indicators feasible. However the change in the economic classification, that was relevant especially in the ser- vice sector, has raised significant methodological issues in the determination of the seasonal component, as for example the presence of seasonal level shift. Although Istat’ strategy for seasonal adjustment is based on TRAMO-SEATS procedure, in this work different diagnos- tics useful to provide empirical evidences on seasonal outliers detection are exploited. In more detail, the TRAMO-SEATS framework was integrated with X12-ARIMA diagnostic on seasonal outliers by applying the Demetra + procedure that combines TRAMO-SEATS and X12-ARIMA procedures in a unique framework.

Keywords: Seasonal adjustment; Demetra +; Service Turnover; Seasonal Break. (search for similar items in EconPapers)
JEL-codes: C22 C43 L80 (search for similar items in EconPapers)
Date: 2015
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