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The R values are computed from the mean number of cases over 7 days and assume a generation interval of 4 days, according to the method as described by the Robert Koch Institut with the difference that this application starts at the number of cases reported today. To get an idea of the change of R in time, the R values of the last 7 days are shown.
Since ECDC only released the accumulated data over the holiday period (2021-12-22 until 2022-01-02) the R-value can not be computed. Until 2022-01-10 the only information that will be updated comes from RIVM, in particular data from the provinces of the Netherlands.