# ASC's Blog: Where Psychometrics Is Cool!

(well, it always is…)

Keep on reading for easy-to-digest articles on psychometric topics, industry news, and guest posts from experts.

Psychometrics

### Tips to Improve Assessment Security During COVID-19

The COVID-19 Pandemic drastically changing all aspects of our world, and one of the most impacted areas is educational assessment and other types of assessment.

Psychometrics

### Responses in Common (RIC)

This collusion detection (test cheating) index simply calculates the number of responses in common between a given pair of examinees.  For example, both answered ‘B’

Psychometrics

### Exact Errors in Common (EEIC) – collusion detection

Exact Errors in Common (EEIC) is an extremely basic collusion detection index simply calculates the number of responses in common between a given pair of

Psychometrics

### Errors in Common (EIC) exam cheating index

This exam cheating index (collusion detection) simply calculates the number of errors in common between a given pair of examinees.  For example, two examinees got

Psychometrics

### Harpp, Hogan, & Jennings: Response Similarity

Harpp, Hogan, and Jennings (1996) revised their Response Similarity Index somewhat from Harpp and Hogan (1993). This produced a new equation for a statistic to

Psychometrics

### Harpp and Hogan (1993) Response Similarity Index

Harpp and Hogan (1993) suggested a response similarity index defined as      where EEIC denote the number of exact errors in common or identically wrong,

Psychometrics

### Bellezza & Bellezza (1989): Error Similarity Analysis

This index evaluates error similarity analysis (ESA), namely estimating the probability that a given pair of examinees would have the same exact errors in common

Psychometrics

### Frary, Tideman, and Watts (1977): g2 collusion index

The Frary, Tideman, and Watts (1977) g2 index is a collusion (cheating) detection index, which is a standardization that evaluates a number of common responses

Psychometrics

### Wollack 1997 Omega Collusion Index

Wollack (1997) adapted the standardized collusion index of Frary, Tidemann, and Watts (1977) g2 to item response theory (IRT) and produced the Wollack Omega (ω)

Psychometrics

### Wesolowsky (2000) Zjk collusion detection index

Wesolowsky’s (2000) index is a collusion detection index, designed to look for exam cheating by finding similar response vectors amongst examinees. It is in the

Psychometrics

### Response Time Effort

Wise and Kong (2005) defined an index to flag examinees not putting forth minimal effort, based on their response time.  It is called the response

Psychometrics

### Holland K Index and K Variants for Psychometric Forensics

The Holland K index and variants are probability-based indices for psychometric forensics, like the Bellezza & Bellezza indices, but make use of conditional information in

Psychometrics

### What’s the difference between Assess.ai and FastTest?

FastTest has been ASC’s flagship platform for the past 11 years, securely delivering millions of online exams powered with computerized adaptive testing and item response

Psychometrics

### What is a Psychometrician?

A psychometrician is someone who practices psychometrics – the Science of Assessment.  That is, they study the process of assessment development and validation itself, regardless