Exploring Types of Parent Attachment via the Clustering Modules of a New Free Statistical Software, ROP-R.

The aim of the paper is threefold: (1) to demonstrate the rich repertoire of clustering capabilities of a ROPstat and R-based new and free software, called ROP-R, by illustrating several analyses with real psychological data; (2) to show how well ROP-R works in tandem with ROPstat software in complex classification analyses; and (3) to explore some nontrivial types of parent attachment using the clustering modules of ROP-R. Four modules of ROP-R are available for performing cluster analyses (CAs), with several methods (e.g.

Adolescent Drug Use, Relational Variables and Personality Factors.

Objective: An ongoing issue in the study of adolescent drug use is the impact of family and the peer group on the problem of adolescent substance use. The present study has examined relative effects of these contexts as well as personality variables on drug use outcomes.

Method: A test battery measuring various psychological variables was administered to a representative sample of 1652 secondary school students (grades 9 and 11), 876 male (mean age=17,61, SD=0.