philchalmers's user avatar
philchalmers's user avatar
philchalmers's user avatar
philchalmers
  • Member for 11 years, 1 month
  • Last seen this week
25 votes

Item Response Theory vs Confirmatory Factor Analysis

21 votes

Is R output reliable (specially IRT package ltm)

11 votes
Accepted

Is this a Monte Carlo simulation?

8 votes
Accepted

Meaning of large values of parameter b (|b| >>) 4 in IRT theory

8 votes
Accepted

Estimating ability using IRT when the model parameters are known

7 votes

Is there an R package which implements weighted maximum likelihood for Rasch models?

7 votes
Accepted

Cramer's $\phi $ for three-way contingency tables

7 votes
Accepted

How to interpret this lavaan structural equation model?

6 votes

Dealing with least and maximum score in IRT

6 votes
Accepted

Is it always better to extract more factors when they exist?

6 votes

Difference between empirical and marginal reliability of an IRT model

6 votes
Accepted

What is the role of non-anchor items when equating scales across studies using IRT?

5 votes
Accepted

Which R package to use to conduct a latent class growth analysis (LCGA) / growth mixture model (GMM)?

5 votes
Accepted

IRT in R: Does anyone know of an IRT item calibration function that can cope with NA's?

5 votes
Accepted

Why pnorm function and sum of dnorm function differs for same input?

5 votes

How to check goodness of fit for a graded response model in R

4 votes
Accepted

Longitudinal item response theory models in R

4 votes
Accepted

Is it possible to do IRT distractor analysis using R?

4 votes

Item discrimination of poorly targeted items

4 votes

Understanding and applying Item Response Theory

4 votes

Simulating responses to a test for item-response theory

4 votes
Accepted

How is a bifactor IRT model different from a factor analysis?

4 votes

In 1PL model, zero ability equals average ability, or change accuracy?

3 votes

What's the criteria of deleting item?

3 votes
Accepted

IRT monotonicity

3 votes
Accepted

Item information for 4PL under IRT

3 votes
Accepted

Is empirical reliability in IRT the counterpart of internal consistency in CTT?

3 votes
Accepted

Estimating ability with IRT when item parameters are known using R package mirt

3 votes

Acceptable values for discrimination parameter - 2PL IRT Model

3 votes

Unequal Sample Size Effect on Power Calculation