The purpose of this release is to provide a detailed series of monthly unemployment estimates. The release contains both monthly unemployment rates and monthly unemployment volumes.
The Labour Force Survey (LFS) provides benchmark estimates of employment and unemployment for each quarter since the beginning of 1998. These quarterly benchmark estimates are then used to compile monthly data using the Proportional Denton method. The main characteristic of this method is that the monthly Live Register series is used as an indicator to disaggregate the quarterly LFS unemployment series into a monthly series in such a way as to minimise the differences between two consecutive months. It also ensures that the average of three months in a particular calendar quarter is equal to the corresponding LFS estimate.
For months where the quarterly unemployment data are not yet available, the ratio of the LFS monthly estimate to the Live Register monthly estimate (i.e. the benchmark to indicator ratio) is forecast forward in order to extrapolate a monthly LFS estimate. This approach adheres to agreed international practice.
Please see the Technical Note published alongside the August 2020 release which outlines minor changes made to the methodology used for results presented in this release following analysis of recipient and non-recipient claims in the Live Register Series.
To correct for typical seasonal patterns, the data series included have been concurrently seasonally adjusted. This seasonal adjustment is completed by applying the X-12-ARIMA model, developed by the U.S. Census Bureau. In the case of these monthly unemployment estimates, seasonal adjustment is conducted using the indirect approach, where each individual series is independently adjusted. To preserve consistency between the individual and aggregate series, the series for gender, age group and total monthly unemployed are then created from these component series. The series for monthly unemployment rates are likewise created from these component series.
Seasonally adjusting the Monthly Unemployment series during the COVID-19 crisis period will be challenging until the scale and shape of its impact on the time series is better understood. This initial seasonally adjusted result might be revised for some months ahead as future observations become available. Users should be aware that there is increased uncertainty around the seasonally adjusted figures during this period.
Further information regarding the LFS and Live Register series are available from each respective release.
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