2.6.1. Histogram

Similar to the pie chart, the histogram view gives users a graphical way to adjust curves.

When 'View Sidebar' is checked, a thumbnail of the histogram will be shown on the right hand side of the screen. When the user double clicks the thumbnail, or clicks on 'Histogram' from the 'View' drop down menu, a histogram dialog will be displayed on the screen. See figure 2.6.1a.

Spreadsheet view
Figure 2.6.1a: Spreadsheet with sidebar active

Histogram Inital View
Figure 2.6.1b: Histogram Initial View


When the user hovers the mouse over a line additional information is shown. The color and location of the line are dependent on the final grade scheme.



Histogram Hovering to show more information
Figure 2.6.1c: User hovering over lines shows additional information.



Other assignments and categories are also viewable. The user selects the category or assignment from the drop down menu. Sub-categories are shown using arrows items without arrows are graded items. However, the user will not be able to modify the grade scheme for these items.


Histogram showing homework
Figure 2.6.1d: Choosing display categories.


The grade scheme is also applied to these assignments, as shown in figure 2.6.1e.



Histogram Showing individual assignments.
Figure 2.6.1e: Showing homework 1 grade scheme using the histogram.


When the user creates a new final grade scheme the histogram will update to display this. For example if the user creates a +/- final grade scheme it will be shown in the histogram.



Histogram Showing Final Grade Scheme.
Figure 2.6.1f: Showing final grade scheme's effects on a histogram.


In this example of histogram manipulation a 5 letter grade scheme is shown for easy understanding. The user can alter the grade scheme by clicking and dragging the lines of appropriate color to the grade.



User clicking on the line to move.
Figure 2.6.1g: User getting ready to move the bar.
User clicking on the line to move.
Figure 2.6.1h: User getting ready to moving the bar.


The user can also collapse a grade area of the histogram by dragging one grade area into another grade area.



User collapsed C.
Figure 2.6.1i: Grade Scheme no longer has any C students.
Histogram View Changed
Figure 2.6.1j: SpreadSheet after user has changed the number of students to receive a C grade to 0.

It can be seen that the number of B's have been increased.


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