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CPT Help Home -> Specific Menu Items -> Tools -> Validation -> Scatter Plots Validation - Scatter PlotsThe Scatter Plots option shows a graph of the forecast residuals (differences between the forecasts and the observations), as well as a scatter plot of the observations against the forecasts. The scatter plot includes horizontal and veritical divisions that indicate the three categories. In both cases the divisions are defined by the terciles of the observations using all the cases. A least-squares linear regression line is shown on the scatter plot, but only over the range of the forecasts.The y-axis limits on the plots can be set by right-clicking on the image and then selecting the Customise option. The x-axis limits on the scatter plot are automatically set to be the same as for the y-axis. When resetting the axis limits, the maximum and minimum values on the y-axis are indicated and can be reset. Resetting these axis limits will in turn automatically reset the tick-mark interval and number of tick marks. Greater flexibility for setting the tick marks is planned for future releases. Further options for customizing the graphs, including adjusting the size of the fonts, and the size of the images, are available from Options ~ Graphics. The graphics can be saved individually or as a montage as a BMP, EMF, GIF, JPEG, PCX, or PNG file by right-clicking anywhere in the child window and selecting Export. A default name is given to the graphic file, but this name can be changed using the browse button. The quality of the JPEG file can be adjusted using the slider or by the quality indicator, which ranges between 0.01 and 1.00. The highest quality is obtained using 1.00. The size of the JPEG file is affected by the quality chosen, with larger files being generated the higher the selected quality. The image quality for all the graphics formats can be improved by increasing the size of the image (see Options ~ Graphics ~ Graph Scaling). The graphic titles can be set using the Customise option upon right-clicking in the child window. Further details are available under Viewing results.
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