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Begin New Search Topic Conflict Resolution Author Mary Clare Lennon

1. Temporality and Intervention Effects: Trajectory Analysis of a Homeless Mental Health Program

Author:
Mary Clare Lennon, William McAllister, Li Kuang, and Daniel Herman
Publication Date:
03-2005
Content Type:
Working Paper
Institution:
Institute for Social and Economic Research and Policy at Columbia University
Abstract:
Intervention analyses which incorporate temporality over a followup period typically note differences in the patterns of "single-curves" for each the experimental and control groups or differences in temporally-based taxonomies between experimentals and controls. But the former fails to allow for the possibility of subgroups of multiple trajectories and the latter collapses time (e.g., average spell durations) and arbitrarily creates cut-points to form its taxonomies. This paper investigates the utility for intervention research of using latent class growth analysis (LCGA). This method incorporates the more complete temporal information used by single-curve approaches to statistically identify the multiple subgroups at the heart of the taxonomic approach. We do this by reanalyzing a critical time intervention study (CTI) of homeless mentally ill men that used both single-curve and taxonomic approaches. By finding, among other things, differences between experimentals and controls in the number, sizes and patterns of latent subgroups than were found in the prior analysis, we suggest the utility of LCGA for assessing service interventions.
Topic:
Conflict Resolution, Education, and Human Welfare

2. Measuring Economic Disadvantage During Childhood: A Group-Based Modeling Approach

Author:
Mary Clare Lennon, Robert L. Wagmiller, Philip M. Alberti, and J. Lawrence Aber
Publication Date:
06-2004
Content Type:
Working Paper
Institution:
Institute for Social and Economic Research and Policy at Columbia University
Abstract:
Recent research suggest that child well-being and subsequent status attainment are influenced not only by the overall magnitude of exposure to family economic disadvantage during childhood, but also by the age of exposure and significant changes in family economic circumstances. Unfortunately, traditional measures of children's economic deprivation – such as, permanent and transitory income, persistent or cumulative poverty, and the number and length of poverty spells – fail to differentiate between exposure to disadvantage at different stages in childhood and largely ignore how family economic circumstances are changing over time. In this paper we propose a new method for assessing economic disadvantage during childhood that captures both children's overall levels of exposure to economic disadvantage and their patterns of exposure. This new method, which takes advantage of recent advances in finite mixture modeling, uses a longitudinal latent class model to classify children into a limited number of groups with similar histories of exposure to family economic disadvantage. Using this new methodology, group membership can be related to both family background characteristics and achievement in childhood and early adulthood, making it possible both to assess how family characteristics affect patterns of exposure to disadvantage during childhood and directly test alternative theories about the effect of different patterns of exposure on achievement. In this paper the relationship between background factors – such as race, parental education, and family structure – and group membership is investigated, as is the association between group membership and achievement in early adulthood. The use of this technique is demonstrated using data from the Panel Study of Income Dynamics (PSID).
Topic:
Conflict Resolution, Conflict Prevention, Development, and Economics