Official monthly statistics about the Dutch labour force are based on the Dutch Labour Force Survey (LFS). The LFS is a continuously conducted survey that is designed as a rotating panel design. Data collection among selected households is based on a mixed-mode design that uses web interviewing, telephone interviewing and face-to-face interviewing. Monthly estimates about the labour force are obtained with a structural time series model. Due to the COVID-19 pandemic, face-to-face interviewing stopped. It was anticipated that this would have a systematic effect on the outcomes of the LFS and that the lockdown at the same time affected the real monthly labour force figures. The lockdown indeed marked a sharp turning point in the evolution of the series of the monthly labour force figures and strongly increased the volatility of these series. In this paper, it is explained how Statistics Netherlands produced monthly labour force figures during the COVID-19 pandemic. It is shown how the sudden change in the mode effects, because face-to-face interviewing stopped, were separated from real period-to-period changes in the labour force figures. It is also explained how the time series model is adapted to the increased volatility in the labour force figures.

中文翻译：

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估计荷兰 COVID-19 大流行期间的每月劳动力数据

有关荷兰劳动力的官方月度统计数据基于荷兰劳动力调查 (LFS)。LFS 是一项持续进行的调查，设计为旋转面板设计。选定家庭的数据收集基于网络访谈、电话访谈和面对面访谈的混合模式设计。关于劳动力的每月估计是通过结构时间序列模型获得的。由于 COVID-19 大流行，面对面采访停止了。预计这将对 LFS 的结果产生系统性影响，同时封锁也会影响每月的实际劳动力数据。封锁确实标志着月度劳动力数据系列演变的一个急剧转折点，并大大增加了这些系列的波动性。本文解释了荷兰统计局如何在 COVID-19 大流行期间生成每月劳动力数据。它显示了由于面对面访谈停止而导致的模式突然变化如何与劳动力数据的真实时期变化分开。它还解释了时间序列模型如何适应劳动力数据波动性的增加。