VPG is pleased to announce the immediately availability of flexMIRT® Version 3.62. Version 3.62 fixes a bug with multiple-group IRT modeling, and a labeling issue in output delivery. Importantly, Version 3.62 uses a completely new pseudo random number generator (PRNG), replacing the one that has been in use since flexMIRT 2.0. The new proprietary PRNG is based on the popular Mersenne Twister 19937 generator that substantially outperforms the PRNG used by flexMIRT previously. They will lead to slightly different results … Read More
We made minor bug fixes to the IRTPRO installer. The revised installer is available in the VPG Store for registered IRTPRO license holders by clicking on “Download Software” button within My Account – License tab.
Dr. Li Cai will serve on the GRE Board Research Committee for the next three years.
VPG’s Drs. Edwards, Houts, & Cai’s paper entitled “A diagnostic procedure to detect departures from local independence in item response theory models” has been accepted for publication in Psychological Methods.
In January 2017, VPG’s Dr. Edwards joined the faculty of the Department of Psychology at Arizona State University. Dr. Edwards is an Associate Professor in the Quantitative Area. Prior to joining the faculty at ASU, Dr. Edwards was an Assistant (2006-2011) and Associate (2011-2016) Professor in the Quantitative Area of the Department of Psychology at The Ohio State University.
VPG’s Dr. Michael C. Edwards was named Associate Editor for the journal Multivariate Behavioral Research. Multivariate Behavioral Research is a peer-reviewed academic journal published by Taylor & Francis Group on behalf of the Society of Multivariate Experimental Psychology.
Drs. Carrie Houts, Mike Edwards, and R.J. Wirth from VPG and Linda Deal, from Pfizer, published a literature review in Quality of Life Research entitled “A review of empirical research related to the use of small quantitative samples in clinical outcome scale development.”
Dr. R.J. Wirth, VPG President and Managing Partner, has been elected Co-Chair of the ISOQOL Psychometric Special Interest Group. He will take over as Chair-elect this October in Copenhagen at the ISOQOL annual meeting.
Dr. R.J. Wirth will be attending ISOQOL’s Measuring What Matters Symposium on July 25-26 in Washington, DC. Check out our back cover ad in the Measuring What Matters program.
VPG’s Drs. Wirth, Edwards, and Houts have teamed with members of Johnson and Johnson Vision Care, Inc. to develop the Contact Lens User Experience: CLUE assessment system. There is a link to the paper on our News Blog.