YPI - Youth Psychopathic traits Inventory
Resource and Download Site - YPI
The YPI was developed by Henrik Andershed, Margaret Kerr, Håkan Stattin, & Sten Levander.
Welcome to the site about the self-report instrument, YPI. Please acknowledge that the YPI is for research purposes only and please respect the guidelines for its use carefully. You do not need permission to download the YPI from this site. However, please respect that a written permission from the first author of the YPI, Henrik Andershed, is needed before actual use of the YPI.
To use the YPI you will need three things. (1) The article referred to below (2) the YPI questionnaire in your language, and (3) the key to the YPI. These things can be acquired below.
The development and use of the YPI is described in the article below (it is higly recommended that this article is read through carefully before use of the YPI):
Andershed, H., Kerr, M., Stattin, H., & Levander, S. (2002). Psychopathic traits in non-referred youths: A new assessment tool. In E. Blaauw, & L. Sheridan (Eds.), Psychopaths: Current International Perspectives (pp. 131-158). The Hague: Elsevier.
Download the chapter
The above book in which this chapter is included can be ordered using this form:
Order book
The YPI has now been translated to several languages (see below). All versions have been translated by researchers familiar with the concept of psychopathy. Translators' names and affiliations are noted on each version of the YPI.
Download YPI
YPI Swedish version
YPI English version
YPI Dutch version
YPI Islandic version
YPI French version
YPI Russian version
YPI Coding Key
YPI Coding Key (in English)
Translation
Is the YPI nonexistant in your language? Are you interested in translating it for research purposes? Please contact Henrik Andershed.
Important about translation
If you plan to translate the YPI, please be advised that it is highly recommended that two independent translations are made first. These two versions are then combined to one translation. Then, as a final step, the YPI is translated back to english and compared to the original. This process is important and necessary to get a good translation.
Empirical studies using the YPI
Andershed, H., Hodgins, S., & Tengström, A. (in press). Convergent validity of the Youth Psychopathic Traits Inventory (YPI): Association with the Psychopathy Checklist: Youth Version (PCL:YV). Assessment.
Andershed, H., Kerr, M., Stattin, H., & Levander, S. (2002). Psychopathic traits in non-referred youths: A new assessment tool. In E. Blaauw, & L. Sheridan (Eds.), Psychopaths: Current International Perspectives (pp. 131-158). The Hague: Elsevier.
Andershed, H., Kerr, M., & Stattin, H. (2002). Understanding the Abnormal by studying the Normal. Acta Psychiatrica Scandinavica, 106, 75-80.
Dolan, N. C., & Rennie, C. E. (2006). Reliability, validity, and factor structure of the Swedish Youth Psychopathic Traits Inventory in a UK sample of conduct disordered boys. Journal of Forensic Psychiatry & Psychology, 17, 217-229.
Dolan, N. C., & Rennie, C. E. (2006). Psychopathy Checklist: Youth Version and Youth Psychopathic Traits Inventory: A comparison study. Personality and Individual Differences.
Forsman, M., Larsson, H., Andershed, & Lichtenstein, P. (in press). Persistent Disruptive Childhood Behavior and Psychopathic Personality in Adolescence: A twin study. British Journal of Developmental Psychology.
Kansi, J. (2003). The Narcissistic Personality Inventory: Applicability in a Swedish population sample. Scandinavian Journal of Psychology, 44, 441-448.
Larsson, H., Andershed, H., & Lichtenstein, P. (2006). A genetic factor explains most of the variation in the psychopathic personality. Journal of Abnormal Psychology, 115, 221-230.
Larsson, H., Tuvblad, C., Rijsdijk, F. V., Andershed, H., Grann, M., & Lichtenstein, P. (in press). Genetic effects in psychopathic personality explain why persistent adolescent antisocial behavior is heritable. Psychological Medicine.
Poythress, N., Dembo, R., Wareham., J., & Greenbaum, P. E. (2006). Construct validity of the Youth Psychopathic Traits Inventory (YPI) and the Antisocial Process Screening Device (APSD) with justice-involved adolescents. Criminal Justice and Behavior, 33, 26-55.
Skeem, J. L., Cauffman, E. (2003). Views of the downward extension: Comparing the Youth Version of the Psychopathy Checklist with the Youth Psychopathic traits Inventory. Behavioral Sciences and the Law, 21, 737-770.