After
seasonal adjustment, its pace rose by a further 0.3 percent quarter-to-quarter, according to Muchova.
While the BEA's 2015 annual revision took steps to improve
seasonal adjustment, those steps affected data back only to 2012.
In general, the choice of whether to use direct or indirect
seasonal adjustment is related to the level of index aggregation.
Generally, commodity indexes are seasonally adjusted using direct
seasonal adjustment, which produces a more complete elimination of seasonal movements than does the aggregative method.
Residual seasonality is when a statistical process called
seasonal adjustment fails to do its job.
The month's sales translate into an annualized 15.67 million units after
seasonal adjustment.
Turek noted that the large swings in the government numbers, principally in public education, are likely due to hiring and layoff patterns occurring earlier or later than usual, which throw off the
seasonal adjustment factors.
| Financial dictionary:
Seasonal adjustment is a technique used by statisticians to even out swings in figures which are related to the time of year.
unemployment, as measured by Gallup without
seasonal adjustment, is 8.0% in mid-June, unchanged from the end of May but significantly better than the 8.7% for the month of June 2011.
Statisticians from academia and government agencies present methodological studies that illustrate the cross-fertilization between time series modeling and
seasonal adjustment. They cover the periodic modeling of economic time series, estimating time series components with misspecific models, quantifying error in X-11
seasonal adjustments, practical problems in
seasonal adjustment, outlier detection and modeling time series with extreme values, alternative models for seasonal and other time series components, and modeling and estimation for non-seasonal economic time series.
Seasonal adjustment is a statistical method, which eliminates the seasonal component of time series and it is particularly suitable for long-term comparisons and analysis of the data.
The ministry amended preliminary and revised figures for industrial production for the period from January last year to February this year as part of its periodic review of
seasonal adjustment methods.
When appraisers must reach back several months for comparable sales, it is doubtful that they consider making a
seasonal adjustment to estimate what a comparable would sell for flit sold in the current month, beyond some general market trend for appreciation or depreciation patterns that attempts to adjust for the average annualized time impact.
