Results of 2017 review
In total, 115 published series were reviewed in 2017, as detailed in Table 2. This resulted in changes to 23 existing published series (Table 3).
Of the 23 altered series: 1 series which previously showed no seasonality was assigned seasonal adjustment settings; 20 series had their existing seasonal adjustment settings amended to benefit the adjustment; 1 series changed from an indirect adjustment to a direct adjustment and therefore was assigned seasonal adjustment settings.
The remaining series changed from a direct adjustment to an indirect adjustment. A comparison of the direct and indirect adjustment is sometimes carried out in addition to the routine issues reviewed. Consumer credit excluding securitisations was reviewed in this way. As a result, the series was changed to an indirect adjustment, resulting in better diagnostics and less residual seasonality. Chart 1 shows that the new indirect adjustment is smoother than the direct in some periods.
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Seasonal adjustment update 2018
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