These estimates of labour market flows are experimental statistics which have been produced as an aid to understanding the movements in the published Labour Force Survey aggregate estimates. They do not have National Statistics status and are not suitable as labour market indicators in their own right. The headline LFS estimates are published in the monthly Labour Market Statistical Bulletin.
In the Labour Force Survey (LFS) respondents are interviewed for five consecutive quarters over a 12 month period, with 20 per cent of the sample being replaced at each quarter. This allows for a longitudinal dataset to be created over a limited time interval, where respondents’ characteristics can be tracked over their time in the survey.
The ONS publishes population-weighted longitudinal datasets for each calendar quarter. These are available for each quarter since 1997 and can be used to analyse changes in labour market characteristics over two or five quarters. The datasets include "flow" variables, which estimate the size of the movements between the three main labour market statuses of employment, unemployment and economic inactivity.
Monitoring changes in the labour market status of respondents to the Labour Force Survey aids the understanding of the quarterly changes in the levels of employment, unemployment and economic inactivity. These indicators are published as stocks for a given period, with changes expressed as the difference between successive quarters. These quarterly comparisons represent the net changes between the three labour market statuses. The underlying gross flows are usually considerably larger and may not correspond with those implied by the net changes. Estimates of the gross flows between the statuses can be derived from the LFS Longitudinal Datasets and are summarised in this note.
There are two types of LFS longitudinal datasets: two-quarter and five-quarter. These are weighted using the same population estimates as those used in the main quarterly LFS datasets, although the weighting methodology differs (see technical note). Consequently the estimates are broadly consistent with the published aggregates, but not entirely. Also, the datasets are limited to people aged 16-64.
Both types of dataset contain a flow variable with eleven categories, with all combinations of employment, unemployment and economic inactivity accounted for, plus two categories for those entering and leaving the 16-64 population over the quarter. For the purpose of this analysis, those entering or leaving this population are excluded from the measured sample. The stock of the employed, unemployed and inactive at each quarter can therefore be estimated by summing the corresponding flow categories.
For this analysis, the two-quarter datasets have been used in order to gain some insight into the quarterly changes in the headline published aggregates. Also, the sample is more robust and less subject to sampling variation than the five-quarter counterparts (see technical note).
The charts in this article show the estimated gross flows, that is the total inflow or outflow for 16-64 employment, unemployment and inactivity from one calendar quarter to the next. They are not seasonally adjusted. Analysis of the net flows, that is the difference between the total inflow and outflow, are also included and these are compared with the quarterly changes in the published aggregates, partly to give an indication of the robustness of the flows analysis.
There are large flows between each labour market status each quarter.
Gross inflow to unemployment is lower than a year ago. This is due to lower inflows from both employment and inactivity.
The gross inflow to employment is higher than a year ago and the outflow is lower, thereby contributing to strong growth in employment.
The gross inflow to inactivity is the lowest since Q2 2002.
The diagram below shows the gross flow between each economic status between January-March 2012 and April-June 2012. The stocks for each status represent the latter period and are the non-seasonally adjusted aggregates for people aged 16-64.
Gross inflow to unemployment (chart 1) is lower than a year ago. This is due to lower inflows from both employment and inactivity.
The gross outflow from unemployment (chart 2) is broadly the same as a year ago. The flow to employment has increased over the year; whereas the flow to inactivity has decreased over the year.
Chart 3 shows the net flow in quarter 2 2012 as negative and slightly lower than the quarterly change in stock.
The gross inflow to employment (chart 4) is higher than a year ago. This is mainly due to an increase in the inflow from unemployment.
The gross outflow (chart 5) from employment was significantly lower in Q2 2012 when compared with the preceding years. This relates to decreased outflows to both unemployment and inactivity.
The net flow for employment (chart 6) is strongly positive in quarter 2 2012. The net flow is slightly higher than the quarterly change in stock.
The gross inflow to inactivity (chart 7) in quarter 2 2012 was significantly lower than in previous years. The inflows from both the employment and inactivity were lower in Q2 2012 than they were a year ago.
The total outflow from inactivity (chart 8) in quarter 2 2012 is broadly the same as a year ago. The outflow to employment is slightly higher than a year ago, whereas the outflow to unemployment is lower than a year ago.
Chart 9 indicates that the net flow in quarter 2 2012 is negative and is about 50,000 lower than the quarterly change in stock. These differences are explained in technical note point 3.
There are differences between the data used for the published LFS aggregate estimates and the longitudinal data used to estimate the gross flows:
Flows are currently adjusted for non-response bias through special calibration weights in the longitudinal datasets. These aim to account for the propensity of certain types of people to drop out of the LFS between one quarter and the next. For example, housing tenure features in the weighting of the longitudinal data because, historically, households in rented accommodation have been more likely to drop out of the survey than owner-occupiers.
There is some evidence that the longitudinal datasets are affected slightly by response error which causes a slight upward bias in the estimates of the gross flows. For example, if it was erroneously reported that someone had moved from unemployment to employment then, in addition to the outflow from unemployment being overestimated, so would the inflow to employment. In the main quarterly LFS dataset, any such misreporting errors tend to cancel each other out.
The differences in the net flows for inactivity shown in Chart 9 are mainly the result of excluding the entrants to, and leavers from, the population in the flows estimates contained in this piece of analysis. This effect is normally one that increases the number of people who enter inactivity. This is because the increase in inactivity from those people turning 16 is greater than those leaving inactivity due to becoming 65.
The stocks derived from the longitudinal datasets differ from those obtained from the quarterly LFS datasets due to their being based on a subset of the main LFS sample. The restriction to measuring only those who are commonly aged 16-64 across successive quarters discounts those entering or leaving the population and also those over 64. All such people are accounted for in the headline LFS aggregates.
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