Igor Himelfarb
Biographic Data
| ID | 5759413 |
|---|---|
| NAME | Igor Himelfarb |
| GIVEN NAMES | Igor |
| FAMILY NAME | Himelfarb |
| SIGNATURE | HIMELFARB I |
| AFFILIATIONS | National Board of Chiropractic Examiners, Greeley, CO, USA |
| ORCID | 0000-0002-2622-6062 |
| VERIFIED | Yes |
| TOTAL WORKS | 5 |
| TOTAL CITATIONS | 6 |
| WORKS AS AUTHOR | 5 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2015 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 1 |
Item Classification by Difficulty Using Functional Principal Component Clustering and Neural Networks
Maintaining consistent item difficulty across test forms is crucial for accurately and fairly classifying examinees into pass or fail categories. This article presents a practical procedure for classifying items based on difficulty levels using functional data analysis (FDA). Methodologically, we clustered item characteristic curves (ICCs) into difficulty groups by analyzing their functional principal components (FPCs) and then employed a neural …
Using Deep Reinforcement Learning to Decide Test Length
This study explored the application of deep reinforcement learning (DRL) as an innovative approach to optimize test length. The primary focus was to evaluate whether the current length of the National Board of Chiropractic Examiners Part I Exam is justified. By modeling the problem as a combinatorial optimization task within a Markov Decision Process framework, an algorithm capable of constructing test forms from a finite set of items while adher…
A Two-Level Alternating Direction Model for Polytomous Items With Local Dependence
The chiropractic clinical competency examination uses groups of items that are integrated by a common case vignette. The nature of the vignette items violates the assumption of local independence for items nested within a vignette. This study examines via simulation a new algorithmic approach for addressing the local independence violation problem using a two-level alternating directions testlet model. Parameter values for item difficulty, discri…
Theory of mind and executive function in Chinese preschool children
Cross-cultural research on children's theory of mind (ToM) understanding has raised questions about its developmental sequence and relationship with executive function (EF). The current study examined how ToM develops (using the tasks from Wellman & Liu, 2004) in relation to 2 EF skills (conflict inhibition, working memory) in 997 Chinese preschoolers (ages 3, 4, 5) in Chengdu, China. Compared with prior research with other Chinese and non-Chines…
Commitment to Islam in Kazakhstan and Kyrgyzstan
Worthington conceptualized a model of religiosity assessment. The dimensions of the model include Religious Norms, Religious Doctrine, and Authority of Leaders. A 10-item scale for Islamic religious assessment was constructed and administered in Kazakhstan and Kyrgyzstan. First-order factor analysis conducted on the 10 items of the religiosity scale revealed factorial structure corresponding to Worthington’s model. A second-order factor analysis …
Theory of mind and executive function in Chinese preschool children
Cross-cultural research on children's theory of mind (ToM) understanding has raised questions about its developmental sequence and relationship with executive function (EF). The current study examined how ToM develops (using the tasks from Wellman & Liu, 2004) in relation to 2 EF skills (conflict inhibition, working memory) in 997 Chinese preschoolers (ages 3, 4, 5) in Chengdu, China. Compared with prior research with other Chinese and non-Chines…
Commitment to Islam in Kazakhstan and Kyrgyzstan
Worthington conceptualized a model of religiosity assessment. The dimensions of the model include Religious Norms, Religious Doctrine, and Authority of Leaders. A 10-item scale for Islamic religious assessment was constructed and administered in Kazakhstan and Kyrgyzstan. First-order factor analysis conducted on the 10 items of the religiosity scale revealed factorial structure corresponding to Worthington’s model. A second-order factor analysis …
Theory of mind and executive function in Chinese preschool children
Cross-cultural research on children's theory of mind (ToM) understanding has raised questions about its developmental sequence and relationship with executive function (EF). The current study examined how ToM develops (using the tasks from Wellman & Liu, 2004) in relation to 2 EF skills (conflict inhibition, working memory) in 997 Chinese preschoolers (ages 3, 4, 5) in Chengdu, China. Compared with prior research with other Chinese and non-Chines…
A Two-Level Alternating Direction Model for Polytomous Items With Local Dependence
The chiropractic clinical competency examination uses groups of items that are integrated by a common case vignette. The nature of the vignette items violates the assumption of local independence for items nested within a vignette. This study examines via simulation a new algorithmic approach for addressing the local independence violation problem using a two-level alternating directions testlet model. Parameter values for item difficulty, discri…
Item Classification by Difficulty Using Functional Principal Component Clustering and Neural Networks
Maintaining consistent item difficulty across test forms is crucial for accurately and fairly classifying examinees into pass or fail categories. This article presents a practical procedure for classifying items based on difficulty levels using functional data analysis (FDA). Methodologically, we clustered item characteristic curves (ICCs) into difficulty groups by analyzing their functional principal components (FPCs) and then employed a neural …
Using Deep Reinforcement Learning to Decide Test Length
This study explored the application of deep reinforcement learning (DRL) as an innovative approach to optimize test length. The primary focus was to evaluate whether the current length of the National Board of Chiropractic Examiners Part I Exam is justified. By modeling the problem as a combinatorial optimization task within a Markov Decision Process framework, an algorithm capable of constructing test forms from a finite set of items while adher…
Artificial Intelligence (3 works) · Artificial Intelligence (3 works) · Computer Science (3 works) · Psychology (3 works) · Cultural Differences and Values (2 works) · Item response theory (2 works) · Machine learning (2 works) · Mathematics (2 works) · Psychometric Methodologies and Testing (2 works) · Psychometrics (2 works)