22/06/2011 Using DEMETRA+ Enrico INFANTE - ESTAT Unit B2 – Methodology and Research Task Force: SA tools User testing group 22/06/2011 Paris - INSEE.

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Presentation transcript:

22/06/2011 Using DEMETRA+ Enrico INFANTE - ESTAT Unit B2 – Methodology and Research Task Force: SA tools User testing group 22/06/2011 Paris - INSEE

2 Contents Using Demetra+: how to split a series Using Demetra+: direct vs indirect approach Possible bugs in Demetra+.net –Calendar (Labour Day) –Updating a series on excel 22/06/2011Task force: SA tools testing groupEnrico Infante

3 Using Demetra+: how to split a series There are some tricky series that may be split in two or more parts and Seasonally Adjusted using different specifications Demetra+ is able to work with the span but the process is very long and it is not possible to merge the results directly During this process usually Demetra+ does not usually display more than one specification or result at the same time 22/06/2011Task force: SA tools testing groupEnrico Infante

4 Using Demetra+: how to split a series Example: Spain – Production in the construction sector 22/06/2011Task force: SA tools testing groupEnrico Infante Different patterns of seasonality

5 Using Demetra+: how to split a series 22/06/2011Task force: SA tools testing groupEnrico Infante  Three different specifications for one series  We are not able to see them together  The results could be merged manually

6 Using Demetra+: direct vs indirect Aggregate series Direct approach: Seasonally Adjust the aggregate series directly Indirect approach: Seasonally Adjust all the sub-series and then aggregate them Demetra+  TSTools (laboratory) It only gives some graphical information on the two different approaches More details could be shown (e.g. the mean of the absolute percentage deviation series) 22/06/2011Task force: SA tools testing groupEnrico Infante

7 Using Demetra+: direct vs indirect 22/06/2011Task force: SA tools testing groupEnrico Infante Example: Partial European GDP

8 Possible bugs in Demetra+ Calendar – Labour Day –Using a calendar with Labour Day, the system is producing “Invalid processing” 22/06/2011Task force: SA tools testing groupEnrico Infante

9 Updating a series on excel –The way to update an excel file already imported in Demetra+ is to close and reopen the software 22/06/2011Task force: SA tools testing groupEnrico Infante Possible bugs in Demetra+ The series has not been updated!

10 Thank you!! Questions? 22/06/2011Task force: SA tools testing groupEnrico Infante