問題文
A business metric follows a weekly pattern. The team wants a chart showing how today's values compare with the same time one week ago. Which construction does this, and what is the constraint on the offset?
選択肢
- Add the historical anomaly analytics function to the plot, which fetches the same period from previous weeks and plots the difference directly without needing a second plot or a formula.
- Apply a moving window mean of one week to the plot, which smooths the values and lines the current week up against the one before it.
- Clone the plot, add a timeshift of one week to the clone, and add a third plot with a formula subtracting one from the other; the offset must be at least as large as the minimum resolution of the data used in the chart.
- Set the chart's time range to two weeks and read the two halves side by side, because that is the only way to see two different periods at once on a single plot.