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  • Glossary

Dates Graph

The dates graph plots the seriated dates for selected items (items can be excluded in the Artifacts/Assemblages table) as gold dots with their computed date along the vertical axis and their user input date (the Earliest and Latest date fields in the Artifacts/Assemblages table) along the horizontal axis. If the user has entered Earliest and/or Latest dates for an item, the interval between those dates will be represented by a horizontal blue line for the item (the Y value being the seriated date for the item), or a blue dot if Earliest equals Latest. Ideally, the plot should fall along the diagonal if the user input dates are correct (use Show Diagonal to include the diagonal in the plot). Right clicking anywhere on the graph will bring up a popup menu that gives a range of options for manipulating the graph.

Dates Graph Popup Menu

There are five items on the dates graph popup menu.

Hide Graph will close the window containing the dates graph.

Show/Hide Diagonal will show (hide) the ascending diagonal of the graph. In a perfect seriation the data points will lie along the diagonal, if the user input dates (the Earliest and Latest date fields in the Artifacts/Assemblages table - see Errors) are correct.

Show/Hide R² will show (hide) the R² value for the graph. R² is the coefficient of determination, a statistical measure of how well a model approximates the data, in this case how well the computed seriation dates approximate the user input dates (the Earliest and Latest date fields in the Artifacts/Assemblages table - see Errors). An R² of 1 indicates that a model is a perfect fit to the data.

Set Axis Labels allows the user to set the axis labels. The default value for the X axis is User Date and for the Y axis is Computed Date.

Save Graph saves the graph to a separate graphics file. The graph can be saved as a graphics file in a variety of formats (GIF, JPEG, PNG, BMP, TIFF, EMF).