Cluster analysis was used to categorize stressful life events into groups based on the effect (or mediational) pattern linking each event to external criteria defined within an overarching conceptual model. To illustrate the utility of "effect size clustering," we examined the structure of stressful
Controlling for the endogeneity of peer substance use on adolescent alcohol and tobacco use
โ Scribed by Edward C. Norton; Richard C. Lindrooth; Susan T. Ennett
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 101 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1057-9230
No coin nor oath required. For personal study only.
โฆ Synopsis
This study examines whether the effects of peer substance use on adolescent alcohol and tobacco use are due to endogeneity of adolescents selecting their peer group. We analyzed data collected for a longitudinal analysis of a drug-use prevention programme for upper elementary school students. We used a two-step probit regression to control for the potentially endogenous explanatory variable peer substance use. Rigorous tests of endogeneity and the validity of the instrumental variables showed that controlling for the endogeneity of peer substance use to reduce bias is not worth the reduction in mean squared error in these data. Peer substance use has a positive and significant effect on adolescent substance use for both drinking and smoking. These results imply that peer influence is empirically more important than peer selection (endogeneity) in our sample of adolescents in grades 6-9. Living in a single-parent family was by far the strongest predictor of adolescent drinking and smoking.
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Grain sorghum of the red and white varieties was malted by steeping in water for 18 h, germinated over 5 days and kilned at 50 ยฐC. The malts were analysed for amylase activities and cyanogenic potential and used to produce burukutu, an alcoholic beverage. The alcohol content of the burukutu was reco