nrs {exametrika} | R Documentation |
Number Right Score
Description
The Number-Right Score (NRS) function calculates the weighted sum of correct responses for each examinee. This function is applicable only to binary response data.
For each examinee, the score is computed as:
NRS_i = \sum_{j=1}^J z_{ij}u_{ij}w_j
where:
-
z_{ij}
is the missing response indicator (0/1) -
u_{ij}
is the response (0/1) -
w_j
is the item weight
Usage
nrs(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 numeric vector containing the Number-Right Score for each examinee. The score represents the weighted sum of correct answers, where:
Maximum score is the sum of all item weights
Minimum score is 0
Missing responses do not contribute to the score
Note
This function is implemented using a binary data compatibility wrapper and will raise an error if used with polytomous data.
Examples
# using sample dataset
nrs(J15S500)