Creating a child feeding index using the demographic and health surveys

Data from the Demographic and Health Surveys (DHS) for five Latin American countries (seven data sets) were used to explore the feasibility of creating a composite feeding index and to examine the association between feeding practices and child height-for-age (HAZ). Urban/rural differences were also examined...The data sets used were Bolivia, 1994 and 1998; Colombia, 1995; Guatemala, 1995 and 1999; Nicaragua, 1998; and Peru, 1996...This work shows that the data available in DHS data sets can be used for a variety of purposes, including to (1) describe and study the distribution of specific feeding practices by geographic area, or other characteristics of interest such as maternal schooling or household socioeconomic status; (2) create a child feeding index to quantify and illustrate associations between child feeding practices and child outcomes, thereby serving as an advocacy tool; and (3) identify practices and vulnerable groups that could be targeted by programs and policies to improve child feeding practices and overall child health and nutrition. In sum, greater use of the DHS data on child feeding practices should be promoted for research and analysis, as a source of guidance on program design and planning, and for advocacy.FCND ,Demography Latin America. ,Surveys Statistical methods. ,Health status indicators. ,Bolivia. ,Colombia. ,Guatemala. ,Nicaragua. ,Peru. ,Child Feeding. ,Children Growth. ,

Common Volatility across Latin American Foreign Exchange Markets

This paper uses high frequency exchange rate data for a group of twelve Latin American countries to analyze volatility comovements. Particular interest is posed on understanding the existence of a common volatility process during the 1994–2005 period. The analysis relies on bivariate common factor models. We test for second-order common features using the common ARCH-feature methodology developed by Engle and Kozicki (1993). Overall, the results of this paper indicate that while most currencies display evidence of time-varying variance, the volatility movements in the Latin American foreign exchange markets seems to be mainly country specific. Only a few markets show evidence of a common volatility process.

Promoting cold-start items in recommender systems

As one of major challenges, cold-start problem plagues nearly all recommender systems. In particular, new items will be overlooked, impeding the development of new products online. Given limited resources, how to utilize the knowledge of recommender systems and design efficient marketing strategy for new items is extremely important. In this paper, we convert this ticklish issue into a clear mathematical problem based on a bipartite network representation. Under the most widely used algorithm in real e-commerce recommender systems, so-called the item-based collaborative filtering, we show that to simply push new items to active users is not a good strategy. To our surprise, experiments on real recommender systems indicate that to connect new items with some less active users will statistically yield better performance, namely these new items will have more chance to appear in other users' recommendation lists. Further analysis suggests that the disassortative nature of recommender systems contributes to such observation. In a word, getting in-depth understanding on recommender systems could pave the way for the owners to popularize their cold-start products with low costs.Comment: 6 pages, 6 figure

External Market Conditions, Competitiveness, Diversification, and Pakistan’s Export Performance

Pakistan’s exports evolve broadly in line with total world imports. Accordingly, Pakistan’s share in world imports was remarkably stable during the last 20 years, ranging between a minimum of 0.12 percent in 1980 and a maximum of 0.18 percent in 1992. In 1999-2000, the share was 0.15 percent. This would suggest that Pakistan’s export performance was not worse than that of the world on average. Compared to regional competitors, however, the performance was unimpressive, especially when compared to China and Thailand throughout the 1980s and 1990s or compared to Bangladesh, India, and Sri Lanka during the 1990s. All these countries succeeded in achieving sustainable market share increases in total world imports. In light of the growing awareness about the importance of exports in the overall economy of Pakistan and in view of the unimpressive export performance of Pakistan vis-à-vis other countries in the region it would be interesting to study the export performance of Pakistan and analyse the possible reasons for this poor performance and see whether it is due to demand deficiency or is it something to do with the supply side of the issue.