--- sourceDocument: Brazil Platform Analytics sourceDocumentLink: https://www.servicenow.com/docs/r/now-intelligence Release : - brazil ft:locale : - en-US ft:publication_title : - Brazil Platform Analytics ft:clusterId : - par bundleId : - par workflow : - Platform --- # Period over period comparison in time series visualizations # Period over period comparison in time series visualizations {#ariaid-title1} Release version: Brazil Updated October 2, 2026 ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 3 minutes to read Period over period comparison overlays several time periods of an indicator on one time series visualization so that you can spot patterns, trends, and anomalies across the periods. When you turn on Compare period over period in the Date range settings of a time series visualization, each period appears as a separate series on the same chart. The periods are aligned by their position within the period, so you can compare, for example, each year's January or each quarter's first month. Without period over period comparison, the visualization shows a single timeline. Note: Period over period comparison is available starting with the Brazil release. ## Requirements {#period-over-period-comparison__period-over-period-comparison-requirements} The Compare period over period setting is available only when the visualization meets all of the following conditions: * The data source is an indicator. Table data sources aren't supported. * The visualization is a time series with a single metric and no group by. * The Number of periods and Period settings are configured. * The chart type is Area, Line, Spline, or Step. Column and Scatter charts aren't supported. * The visualization doesn't use Show maximum range or Set absolute period. Dashboard filters don't work with a time series that has period over period comparison turned on. ## When the setting is hidden {#period-over-period-comparison__period-over-period-comparison-hidden} The Compare period over period setting is hidden, not turned off, in these cases. The visualization then shows a single timeline, and no message appears. * The Period is Days. * The time aggregation unit is the same as the Period unit. For example, the time aggregation is By month and the Period is Months. * The indicator source or the indicator definition uses a business calendar. Standard and Gregorian calendars aren't business calendars. * The indicator is a Data snapshots indicator with a business calendar defined in its trend settings. If you add a business calendar to the indicator source or definition, the visualization reverts to a single timeline on the next display. ## Period units and time aggregation {#period-over-period-comparison__period-over-period-comparison-period-units} The Period options are Days, Weeks, Months, Quarters, and Years. The options depend on the time aggregation. A period can't be shorter than the time aggregation unit. {#period-over-period-comparison__period-over-period-comparison-period-table__entry__2} | Time aggregation | Available periods | |-|-| | Daily | Days, Weeks, Months, Quarters, Years | | By week (SUM, AVG, or LAST) | Weeks, Months, Quarters, Years | | By month (SUM, AVG, or LAST) | Months, Quarters, Years | | By quarter (SUM, AVG, or LAST) | Quarters, Years | | By year (SUM, AVG, or LAST) | Years | [Table 1. Period options by time aggregation] {#period-over-period-comparison__period-over-period-comparison-period-table} If you change the time aggregation to a unit longer than the current Period, the Period changes automatically to the shortest period that is still available. For example, if the Period is Weeks and you change the time aggregation to By month SUM, the Period changes to Months. The Weeks and Quarters options are available for all visualizations that use indicator data and have a Period setting, not only for period over period comparison. ## Series labels and axis labels {#period-over-period-comparison__period-over-period-comparison-labels} The legend, the tooltip, and the data table column headers use the same label for each period. The label depends on the Period unit. {#period-over-period-comparison__period-over-period-comparison-label-table__entry__2} | Period | Label format | |-|-| | Years | Full year, such as 2026 | | Quarters | Q, quarter number, and year, such as Q2 2026 | | Months | Month abbreviation and year, such as Apr 2026 | | Weeks | W, ISO week number, and year, such as W22 2026 | [Table 2. Period labels] {#period-over-period-comparison__period-over-period-comparison-label-table} The x-axis labels reflect the time aggregation, not the Period. The x-axis shows the position within each period. {#period-over-period-comparison__period-over-period-comparison-axis-table__entry__3} | Period | Time aggregation | X-axis labels | |-|-|-| | Years | Daily | Jan 1, Jan 2, through Dec 31 | | Years | By week | Week 1 through Week 52 | | Years | By month | Jan through Dec | | Years | By quarter | Q1 through Q4 | | Quarters | Daily | Month 1 Day 1, Month 1 Day 2, and so on | | Quarters | By week | Week 1 through Week 13 | | Quarters | By month | Month 1 through Month 3 | | Months | Daily | Day 1 through Day 31 | | Months | By week | Week 1 through Week 4 | | Weeks | Daily | Monday through Sunday | [Table 3. X-axis labels by period and time aggregation] {#period-over-period-comparison__period-over-period-comparison-axis-table} ## Settings that aren't available with period over period comparison {#period-over-period-comparison__period-over-period-comparison-unavailable-settings} When Compare period over period is turned on, these settings are hidden or turned off: * Allow change date range * Show target * Show forecast * Show trend * Show confidence band * Show comment * Show filter as separate series The Show threshold setting remains available. * **[Compare periods in a time series visualization](https://www.servicenow.com/docs/s7C6exMy9ryg1DGnUycB7g)** Overlay several periods of an indicator on one time series visualization to compare the same point in each period.