Citation

Yuma Y. Shinrigaku Kenkyu 2010; 81(3): 218-225.

Affiliation

Hyogo University of Teacher Education, Shimokume, Kato 673-1494, Japan. yuma@hyogo-u.ac.jp

Copyright

(Copyright © 2010, Japanese Psychological Association, Publisher University of Tokyo Press)

DOI

unavailable

PMID

20845727

Abstract

This research examined the effect of prison population densities (PPD) on inmate-inmate prison violence rates (PVR) in Japan using one-year-interval time-series data (1972-2006). Cointegration regressions revealed a long-run equilibrium relationship between PPD and PVR. PPD had a significant and increasing effect on PVR in the long-term. Error correction models showed that in the short-term, the effect of PPD was significant and positive on PVR, even after controlling for the effects of the proportions of males, age younger than 30 years, less than one-year incarceration, and prisoner/staff ratio. The results were discussed in regard to (a) differences between Japanese prisons and prisons in the United States, and (b) methodological problems found in previous research.

Language: ja