Consumer Research • Item Analysis • Item Analysis Platform Options
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Item Analysis Platform Options
Number of Plots Across
Enables you to specify how many ICC plots to display in each row of plots in the Characteristic Curve report. The default is one ICC plot per row.
Save Ability Formula
Saves the ability formula to a new column in the data table. See Redo Menusand Save Script Menusin the Using JMP book for more information about the following options:
Redo
Contains options that enable you to repeat or relaunch the analysis. In platforms that support the feature, the Automatic Recalc option immediately reflects the changes that you make to the data table in the corresponding report window.
Save Script
Contains options that enable you to save a script that reproduces the report to several destinations.
Save By-Group Script
Contains options that enable you to save a script that reproduces the platform report for all levels of a By variable to several destinations. Available only when a By variable is specified in the launch window.
Statistical Details for the Item Analysis Platform
Item response theory (IRT) uses a series of equations to relate items to an unobserved (latent) trait or ability. Items, or questions, are indicators of an underlying latent construct that cannot be directly observed. At the time of data collection, both the subject abilities and the item characteristics are unknown.

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Help created on 9/19/2017