Certification exam data for the teaching labs

Simulated responses of 1,200 candidates to a fictional 32-item, five-option certification exam taken in English or French. Item parameters are based on a 3PL calibration of mirt's mirt::SAT12 data, so the items behave like real ones. Some problems were planted on purpose for the teaching labs; lab_truth() lists them.

Usage

certexam

certexam_key

Format

certexam is a data frame with 1,200 rows and 34 columns: id (candidate ID), language (factor, English or French) and Q01 to Q32 (the option chosen, A to E). certexam_key is a named character vector with the published answer key for Q01 to Q32.

An object of class character of length 32.

Source

Simulated; the script is data-raw/certexam.R in the package's GitHub repository.

Examples

head(certexam[, 1:6])
#>      id language Q01 Q02 Q03 Q04
#> 1 C0001   French   E   B   C   B
#> 2 C0002  English   E   B   A   D
#> 3 C0003  English   B   C   E   D
#> 4 C0004  English   C   C   E   C
#> 5 C0005  English   A   B   A   B
#> 6 C0006   French   B   C   E   E
scored <- key2binary(certexam[, -(1:2)], certexam_key)