Rolling Reference Period
when determining how an aspect of your job measures against a given standard, your employer may use a rolling reference period. This basically means keeping a count current, so you're always using the most relevant data.
For example, if you're checking the hours you work against the working time directive limits, you work out average hours over 17 weeks. After you've worked 17 weeks, you work out an average from weeks 1 to 17. If it's a rolling reference period, when you get to week 18, you average weeks 2 to 18, in week 19 it's an average of weeks 3 to 19, and so on.
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