WITHIN‐MOTHER ESTIMATES OF THE EFFECTS OF WIC ON BIRTH OUTCOMES IN NEW YORK CITY

There is a large literature suggesting that “WIC works” to improve birth outcomes. However, methodological limitations related to selection into the Women, Infants, and Children (WIC) program have left room for doubt about this conclusion. This article uses birth records from New York City to address some limitations of the previous literature. We estimate models with mother fixed effects to control for fixed characteristics of mothers and we directly investigate the way that time‐varying characteristics of mothers affect selection into the WIC program. We find that WIC is associated with reductions in low birth weight, even among full‐term infants, and with reductions in the probability that a child is “small for dates.” These improvements are associated with a reduction in the probability that the mother gained too little weight during pregnancy. Improvements tend to be largest for first born children. We also find that women on WIC are more likely to be diagnosed with chronic conditions, and receive more intensive medical services, a finding that may reflect improved access to medical care. (JEL I12, H42)     

A visual methods approach for researching children’s perspectives: capturing the dialectic and visual reflexivity in a cross-national study of father-child interactions

ABSTRACT

The paper presents a visual methods approach from a cross national methodological project that used digital visual technologies to examine young children's perspectives in father-child interactions. The approach combines capturing the dialectic with visual reflexivity. The notion of ‘capturing the dialectic’ specifically by analysing conflict to gather the child’s intention as their perspective, is underpinned by finding the contradictions in a situation of which children are a part. Visual technologies and in particular digital film does this, because it can identify difference, as it observes and captures the dialectic process. Researchers collected between 5–10 hours of film footage and twenty-four film elicitation interviews from young children and their fathers in twelve families within England, Hong Kong, Norway and India. In the study, participants took footage of routine father-child interactions chosen by the children; and researchers sampled the footage for situations of conflict and emotionally charged moments in order to capture the dialectic. Researchers then conducted film elicitation interviews with the children and fathers, which were recorded for the purpose of visual reflexivity. This visual methods approach can support social science researchers to address differences in representation and truth, for a better understanding of a young child’s perspective in cross-national projects.     

Water Quality Failures in Distribution Networks—Risk Analysis Using Fuzzy Logic and Evidential Reasoning

The evaluation of the risk of water quality failures in a distribution network is a challenging task given that much of the available data are highly uncertain and vague, and many of the mechanisms are not fully understood. Consequently, a systematic approach is required to handle quantitative-qualitative data as well as a means to update existing information when new knowledge and data become available. Five general pathways (mechanisms) through which a water quality failure can occur in the distribution network are identified in this article. These include contaminant intrusion, leaching and corrosion, biofilm formation and microbial regrowth, permeation, and water treatment breakthrough (including disinfection byproducts formation). The proposed methodology is demonstrated using a simplified example for water quality failures in a distribution network. This article builds upon the previous developments of aggregative risk analysis approach. Each basic risk item in a hierarchical framework is expressed by a triangular fuzzy number, which is derived from the composition of the likelihood of a failure event and the associated failure consequence . An analytic hierarchy process is used to estimate weights required for grouping noncommensurate risk sources. The evidential reasoning is proposed to incorporate newly arrived data for the updating of existing risk estimates. The exponential ordered weighted averaging operators are used for defuzzification to incorporate attitudinal dimension for risk management. It is envisaged that the proposed approach could serve as a basis to benchmark acceptable risks in water distribution networks.