AUTHOR=Sheng Yanyan TITLE=Editorial: Fitting Psychometric Models: Issues and New Developments JOURNAL=Frontiers in Psychology VOLUME=8 YEAR=2017 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.00856 DOI=10.3389/fpsyg.2017.00856 ISSN=1664-1078