InterItemAnalysis {exametrika} | R Documentation |
Inter-Item Analysis
Description
Inter-Item Analysis returns various metrics for analyzing relationships between pairs of items. This function is applicable only to binary response data. The following metrics are calculated:
JSS: Joint Sample Size
JCRR: Joint Correct Response Rate
IL: Item Lift
MI: Mutual Information
Phi: Phi Coefficient
Tetrachoric: Tetrachoric Correlation
Each metric is returned in matrix form where element (i,j) represents the relationship between items i and j.
Usage
InterItemAnalysis(U, na = NULL, Z = NULL, w = NULL, ...)
Arguments
U |
U is a data matrix of the type matrix or data.frame. |
na |
na argument specifies the numbers or characters to be treated as missing values. |
Z |
Z is a missing indicator matrix of the type matrix or data.frame |
w |
w is item weight vector |
... |
Internal parameters for maintaining compatibility with the binary data processing system. Not intended for direct use. |
Value
A list of class "exametrika" and "IIAnalysis" containing the following matrices:
- JSS
Joint Sample Size matrix
- JCRR
Joint Correct Response Rate matrix
- IL
Item Lift matrix
- MI
Mutual Information matrix
- Phi
Phi Coefficient matrix
- Tetrachoric
Tetrachoric Correlation matrix
Note
This function is implemented using a binary data compatibility wrapper and will raise an error if used with polytomous data.
Examples
# example code
InterItemAnalysis(J15S500)