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  • Seasonal Adjustment

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Seasonal Adjustment - X-12-ARIMA -

RegARIMA models have revised on January 31, 2025.   (Since the result of January 2025)

Series ARIMA model Regression variables Reason for setting
Labour force Total (211)(012)

LS2011.3
LS2020.4

Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Male (012)(111)

TL2020.4-2020.6

Temporary level change due to the impact of the spread of COVID-19 infection from April 2020 to June 2020

Female (012)(012)

LS2011.3
LS2020.4

Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Employed persons Total (111)(012)

LS2009.3
LS2011.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Male (111)(012)

LS2009.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the spread of COVID-19 infection since April 2020

Female (012)(012)

LS2009.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the spread of COVID-19 infection since April 2020

Employee Total (212)(012)

LS2009.3
LS2011.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Male (012)(111)

LS2009.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the spread of COVID-19 infection since April 2020

Female (012)(112)

LS2009.3
LS2011.3
LS2020.4

Level change due to the impact of the collapse of the Lehman Brothers since March 2009
Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Regular employee Total (012)(012)

-

-

Male (012)(012)

-

-

Female (211)(012)

-

-

Non-regular employee Total (211)(111)

LS2020.4

Level change due to the impact of the spread of COVID-19 infection since April 2020

Male (012)(012)

LS2020.4

Level change due to the impact of the spread of COVID-19 infection since April 2020

Female (111)(212)

LS2020.4

Level change due to the impact of the spread of COVID-19 infection since April 2020

Unemployed persons Total (012)(011)

RP2008.10-2009.7
RP2020.3-2020.10

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since March 2020

Male (112)(012)

RP2008.10-2009.7
RP2020.3-2020.10

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since March 2020

Female (212)(012)

RP2008.10-2009.3
RP2020.4-2020.8

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since April 2020

Not in labour force Total (012)(212)

LS2011.3
LS2020.4

Level change due to the impact of the Great East Japan Earthquake since March 2011
evel change due to the impact of the spread of COVID-19 infection since April 2020

Male (012)(111)

TL2020.4-2020.6

Temporary level change due to the impact of the spread of COVID-19 infection from April 2020 to June 2020

Female (012)(012)

LS2011.3
LS2020.4

Level change due to the impact of the Great East Japan Earthquake since March 2011
Level change due to the impact of the spread of COVID-19 infection since April 2020

Unemployment rate Total (210)(011)

RP2008.10-2009.7
RP2020.3-2020.10

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since March 2020

Male (112)(012)

RP2008.10-2009.7 RP2020.3-2020.10

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since March 2020

Female (012)(012)

RP2008.10-2009.3
RP2020.4-2020.8

Ramp level change due to the impact of the collapse of the Lehman Brothers since autumn 2008
Ramp level change due to the impact of the spread of COVID-19 infection since April 2020

  • On the release of January results, the seasonally adjusted data for the most recent 10 years are revised by retroactively computing final seasonal factors using the original data for up to 29 years.
  • The lower and upper sigma limits used to downweight extreme irregular values are 9.8 sigma and 9.9 sigma.
  • X-12-regARIMA was introduced to 24 series. As in the past, X-11(default) has been applied to series which are not mentioned.(March 2, 2021)

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