JointSampleSize {exametrika} | R Documentation |
Joint Sample Size
Description
The joint sample size is a matrix whose elements are the number of individuals who responded to each pair of items.
Usage
JointSampleSize(U, na = NULL, Z = NULL, w = NULL)
## Default S3 method:
JointSampleSize(U, na = NULL, Z = NULL, w = NULL)
## S3 method for class 'binary'
JointSampleSize(U, na = NULL, Z = NULL, w = NULL)
Arguments
U |
Either an object of class "exametrika" or raw data. When raw data is given,
it is converted to the exametrika class with the |
na |
Values to be treated as missing values. |
Z |
Missing indicator matrix of type matrix or data.frame. Values of 1 indicate observed responses, while 0 indicates missing data. |
w |
Item weight vector specifying the relative importance of each item. |
Value
Returns a matrix of class c("exametrika", "matrix") where each element (i,j) represents the number of students who responded to both item i and item j. The diagonal elements represent the total number of responses for each item.
Note
This function is implemented using a binary data compatibility wrapper and will raise an error if used with polytomous data.