From the PARcore Data Visualization Studio Landing Page, navigate to this report by selecting the Test Characteristic Curves icon.   This report is only applicable for requests that include the Analysis Type of Item Response Theory with an Equate analysis selected and the optional analysis of "Test Characteristic Curve".  If this request does not include any analyses with that optional report selected, the icon for this report will not appear on the landing page and cannot be selected. 

The bento box menu icon at the top left of the report can be used to navigate back to the Landing Page.
 



Information about the request that is being viewed are displayed at the top, including the request number, admin, test, form ID or package ID, and user form code. 


When first launching the report it will be empty.  Make initial filter selections in order to visualize the report.  Any filter with a red asterisk indicates it is required to have a selection made before the report can be displayed.


Choose Filters






Refer to Visualize Results for general information about filter navigation for any report.  The filter for this report is:
     

• Analysis - select one analysis sequence number to view at a time.  The analysis sequence number will reflect the sequencing from Request Details for this request.
  • Upon first initializing this dashboard, the filter will display as (Choose your analysis) and a selection must be made. 
    • Select the search icon (magnifying glass) and enter search text to see Analysis filter options for the request you are viewing. 
    • Using an asterisk in the search text box will display all possible analyses to choose from.  
  • Once the current analysis results have been reviewed, continue to use the search feature or utilize the slider arrows (< and >) to view each analysis one at a time.  If there is only one analysis for this report the navigation buttons will be disabled.
  • The analysis template name used for this request analysis as well as the score being analyzed will also be included in the filter description.
  • Only analyses that include the "Test Characteristic Curve" optional analysis will be available in this filter. 

• Set X-axis Range - select the radio button for the preferred x-axis range to display in your plot. 
  • Limit range -4 to 4:  This is the default display and will display only true scores for the ability ranges of -4 through 4. 
  • Show all observed values:  If this alternative range option is selected the x-axis range is not limited and expands or contracts based on the actual range of abilities observed in the data.  

Test Characteristic Curves

There are two curves displayed. 

• The y-axis is the True Score.
• The x-axis is the Ability statistic values.  The range of the abilities displayed can be modified using the "Set X-axis Range" radio button filter if desired.   
  • The zoom feature can also be used to set a different range for either or both axes.  Refer to Visualize Results for general information about the zoom functionality.  
• A legend indicates that the thicker red line is for the reference statistics (when applicable), and the thinner blue line are the new statistics.
• A tooltip displays when hovering over either line to reveal the True Score and Ability values at that data point.