Traditionally price index theory has been remarkably free from the influence of time series.
As time series modelling seems to offer various advantages, we proposed to investigate some of its consequences. Our main goal is to develop models that can be used to forecast the present HICP using data from the (recent) past, which amounts to an exercise in nowcasting. Price index series modelled as time series offers various advantages. Using data from the (recent) past also is attractive as more efficient use of the data is made.