This paper intends to show that the variations in the target rate level and the duration between two variations in the target rate do not necessarily react to the same factors. For this purpose, the paper uses a model derived from Engle and Russell (2005). It proposes to model differently the duration between two changes in the target rate and the target rate variations. Extracting the factors driving monetary policy using enhanced principal component analysis, namely the partial least square algorithm, the paper shows that durations and the variations in the target rate time series react differently to each factor.