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The authors have developed and tested scale-up methods, based on a simple social network theory, to estimate the size of hard-to-count subpopulations. The authors asked a nationally representative sample of respondents how many people they knew in a list of 32 subpopulations, including 29 subpopulations of known size and 3 of unknown size. Using these(More)
Results from a representative survey of respondents in Florida are given, concerning their knowledge about members of their personal network, and specifically how many people respondents know in selected subpopulations. We employ a method known as a "network scale-up method". By using a collection of subpopulations of known size, and also asking about one(More)
We asked respondents how many people they knew in many subpopulations. These numbers, averaged over large representative samples, should vary proportionally to the size of the subpopulations. In fact, they do not. We give two different interpretations of this finding. The first interpretation notes that the responses are linear in subpopulation size for(More)
Accurate estimates of the sizes of certain subpopulations are needed to inform important public policy decisions in the US. Laumann et al. (1989, 1993) have attempted to assess the accuracy of the reported data on the incidence of AIDS in the US, collected by the Centers for Disease Control and published in the AIDS Weekly Surveillance Reports (AWSR) and(More)
An individual's h-index corresponds to the number h of his/her papers that each has at least h citations. When the citation count of an article exceeds h, however, as is the case for the hundreds or even thousands of citations that accompany the most highly cited papers, no additional credit is given (these citations falling outside the so-called " Durfee(More)
This research reports on an analysis of personal network data collected from 70 HIV-positive HIV/AIDS patients (48 men, 22 women; 45 black, 25 white). Issues examined were the conditions surrounding the difficulty of knowing information about social network members, including knowledge of HIV status. The stigmatizing nature of AIDS resulted in selective(More)
Ray theory is used to predict phase and group velocities for long planetary waves under realistic, albeit slowly varying, oceanic conditions. The results are compared with local theory using fields smoothed to the same amount (9Њ latitude/longitude) as well as those with much less smoothing (1Њ). The agreement is excellent, showing that local theory forms a(More)
published in the fields of health, epidemiology, sociological theory, religion and methodology, but his main interest continues to be social networks. Peter D. Killworth, Ph.D., is an individual merit scientist 2(I) and professor at the National Oceanography Centre, Southampton, UK. His main research is on ocean process modeling, including the properties of(More)