Table of Contents
Check the series
A chart needs a consistent currency, purity, unit and source. Changing any of these changes what the number represents. This website recalculates a selected weight from the same stored series and keeps separate data sources separate.
Understand the dates
A daily point is the latest accepted snapshot collected for that market date. It may not be an official close or the day’s highest or lowest price. A day without a collected record remains missing instead of being filled with an invented observation.
Compare changes fairly
An absolute change is the later value minus the earlier value. A percentage change divides that difference by the earlier value and multiplies by 100. Both observations must exist and represent the same series. If yesterday has no observation, a comparison with the previous available date should say so.
Choose the time window
The last seven calendar days include the current date. The previous complete week is the most recent finished Monday-to-Sunday period. These windows answer different questions and may contain different numbers of recorded observations.
A chart is a record
Historical movement does not establish the next price. Use the chart to understand recorded changes and the quality of the available data, alongside the source and methodology.