Diagnostic classification
models
A brief introduction
- Traditional assessments and psychometric models measure an overall skill or ability
- Assume a continuous latent trait
Traditional methods
- The output is a weak ordering of albums due to error in estimates
- Confident Taylor Swift (debut) is the worst
- Not confident on ordering toward the middle of the distribution
- Limited in the types of questions that can be answered.
- Why is Taylor Swift (debut) so low?
- What aspects do each album demonstrate proficiency or competency of?
- How much skill is “enough” to be competent?
Music example
- Rather than measuring overall musical knowledge, we can break music down into set of skills or attributes
- Songwriting
- Production
- Vocals
- Attributes are categorical, often dichotomous (e.g., proficient vs. non-proficient)
Diagnostic classification models
- DCMs place individuals into groups according to proficiency of multiple attributes
|
|
|
|
|