A note on using alpha and stratified alpha to estimate the reliability of a test composed of item parcels

Several authors have suggested that prior to conducting a confirmatory factor analysis it may be useful to group items into a smaller number of item ‘parcels’ or ‘testlets’. The present paper mathematically shows that coefficient alpha based on these parcel scores will only exceed alpha based on the entire set of items if W, the ratio of the average covariance of items between parcels to the average covariance of items within parcels, is greater than unity. If W is less than unity, however, and errors of measurement are uncorrelated, then stratified alpha will be a better lower bound to the reliability of a measure than the other two coefficients. Stratified alpha are also equal to the true reliability of a test when items within parcels are essentially tau‐equivalent if one assumes that errors of measurement are not correlated.     

Does the presence of priming hinder subsequent recognition or recall performance?

Declarative and non-declarative memories are thought be supported by two distinct memory systems that are often posited not to interact. However, Wagner, Maril, and Schacter (2000a) reported that at the time priming was assessed, greater behavioural and neural priming was associated with lower levels of subsequent recognition memory, demonstrating an interaction between declarative and non-declarative memory. We examined this finding using a similar paradigm, in which participants made the same or different semantic word judgements following a short or long lag and subsequent memory test. We found a similar overall pattern of results, with greater behavioural priming associated with a decrease in recognition and recall performance. However, neither various within-participant nor various between-participant analyses revealed significant correlations between priming and subsequent memory performance. These data suggest that both lag and task have effects on priming and declarative memory performance, but that they are largely independent and occur in parallel.     

Object continuity and the transsaccadic representation of form

Transsaccadic object file representations were investigated in three experiments. Subjects moved their eyes from a central fixation cross to a location between two peripheral objects. During the saccade, this preview display was replaced with a target display containing a single object to be named. On trials on which the target identity matched one of the preview objects, its orientation either matched or did not match the previewed orientation. The results of Experiments 1 and 2 revealed that orientation changes disrupt perceptual continuity for objects located near fixation, but not for objects located further from fixation. The results of Experiment 3 confirmed that orientation changes do not disrupt continuity for distant objects, while showing that subjects nevertheless maintain an object-specific representation of the orientation of such objects. Together, the results suggest that object files represent orientation but that whether or not orientation plays a role in the processes that determine continuity depends on the quality of the perceptual representation.     

Is schizotypy taxonic? Response to

Beauchaine, Lenzenweger, and Waller (2008) criticize our taxometric study of schizotypy (Rawlings, Williams, Haslam, & Claridge, in press) on a variety of methodological and philosophical grounds. We argue that their critique selectively applies more stringent standards to our work than to studies supporting their view that schizotypy is taxonic (i.e., categorical). Many of their criticisms apply at least equally to existing studies that offer support for a schizotypy taxon, and these studies are vulnerable to biases favouring taxonic conclusions that were controlled for in our study. Contrary to their criticisms, we did not claim to have disconfirmed previous taxonic findings about schizotypy, and our findings positively support dimensional models of schizotypy rather than merely being null results. Similarly, our findings are not artefacts of the sampling or measurement decisions that they question. Even well-replicated taxometric findings are not immune to empirical challenge, and evaluation of such challenges must be even-handed.     

Suicidal ideation in college students varies across semesters: the mediating role of belongingness

The interpersonal-psychological theory of suicidal behavior (Joiner, 2005) proposes that the need to belong is fundamental; when met it can prevent suicide and when thwarted it can substantially increase the risk for suicide. We investigate one source of group-wide variation in belongingness among college students--changes in the social composition of college campuses across academic semesters--as an explanation for variation in suicidal ideation across the academic year. Our results indicate that in a sample of college students at a large southern state university (n = 309), suicidal ideation varied across academic semesters, with highest levels in summer compared to both spring and fall. Differences in suicidal ideation between summer and spring were, in large part, accounted for by belongingness. Theoretical, as well as practical, implications are discussed regarding mechanisms for seasonal variation in suicidal ideation.     

Interparental conflict, negative parenting, and children's adjustment: bridging links between parents' depression and children's psychological distress

Pathways linking parental depressive symptoms, adult relationship insecurity, interparental conflict, negative parenting, and children's psychological adjustment (internalizing symptoms and externalizing problems) were assessed using a 3-wave longitudinal research design. Two-parent families (N = 352) with 11- to 13-year-old children (179 boys, 173 girls) participated in the study. Maternal and paternal depressive symptoms were associated with insecurity in adult close relationships assessed 12 months later, which was concurrently related to heightened levels of interparental conflict. Controlling for children's initial symptom levels, interparental conflict was related to child appraisals of father and mother rejection assessed an additional 12 months later, which were related to children's internalizing symptoms and externalizing problems, respectively. Results are discussed with regard to the implications for understanding the complex interplay between adult depressive symptoms, attributions in close adult relationships, interparental conflict, negative parenting, and children's psychological adjustment.     

Perfectionism,Distress, and Irrational Beliefs in High School Students: Analyses with an Abbreviated Survey of Personal Beliefs for Adolescents

The current study examined the associations between dimensions of perfectionism and irrational beliefs in an adolescent sample. In addition, we tested the association between psychological distress and irrational beliefs in adolescents and we evaluated the feasibility of creating a modified version of the Survey of Personal Beliefs for use with adolescents. A sample of 250 adolescents (108 males, 142 females) completed the Child-Adolescent Perfectionism Scale, the Survey of Personal Beliefs, and the CES-D Depression Scale. Initial psychometric analyses yielded an abbreviated 30-item Survey of Personal Beliefs with adequate internal consistency for four of the five subscales. Our results showed that self-oriented perfectionism was associated significantly with all five irrational belief subscales, while the associations between socially prescribed perfectionism and irrational belief subscales were much smaller in magnitude. Self-oriented perfectionism, socially prescribed perfectionism, and irrational beliefs were all associated significantly with elevated distress among adolescents, and irrational beliefs predicted unique variance in distress, over and above the variance attributable to the trait perfectionism dimensions. The findings confirmed the association between perfectionism and irrational beliefs and their respective roles in psychological distress among adolescents.     

Purpose in Life, Satisfaction with Life, and Suicide Ideation in a Clinical Sample

This study examined the role of purpose in life and satisfaction with life in protecting against suicide ideation in a clinical psychiatric sample. Forty-nine psychiatric patients completed self-report measures of suicide ideation, purpose in life, satisfaction with life, neuroticism, depression, and social hopelessness. Zero-order correlations indicated significant associations between suicide ideation and the various predictors, in the hypothesized directions. Regression analyses illustrated that purpose in life and satisfaction with life accounted for significant additional variability in suicide ideation scores above and beyond that accounted for by the negative psychological factors alone. Purpose in life also mediated the relation between satisfaction with life and suicide ideation and moderated the relation between depression and suicide ideation. These findings demonstrate the potential value of attending to both resilience and pathology when building predictive models of suicide ideation and of attending to key existential themes when assessing and treating suicidal individuals.