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J L Simon

Publications and source records attributed to J L Simon.

60 records · Page 4Linked to original sources
PubMedDate not supplied

The effect of immigrants on natives' incomes through the use of capital.

"This paper deals with questions about the effects of immigrants on three types of capital: the private capital immigrants work with, the public (government) capital that immigrant workers use, and the public capital used for services by immigrants." The geographic focus is on the United States. The authors conclude that although the average cost to natives in 1975 dollars to provide services for immigrants is 4,172 dollars, this amount "is considerably smaller than the benefits of immigrants to natives through their relatively low use of welfare services and their relatively high contribution of taxes." Comments by Jacob Mincer (pp. 95-7) are included.

Americas↗
PubMedDate not supplied

Age, temperature, and parasitaemia predict chloroquine treatment failure and anaemia in children with uncomplicated Plasmodium falciparum malaria.

The prevalence of chloroquine-resistant Plasmodium falciparum malaria has been increasing in sub-Saharan Africa and parts of South America over the last 2 decades, and has been associated with increased anaemia-associated morbidity and higher mortality rates. Prospectively collected clinical and parasitological data from a multicentre study of 788 children aged 6-59 months with uncomplicated P. falciparum malaria were analysed in order to identify risk factors for chloroquine treatment failure and to assess its impact on anaemia after therapy. The proportion of chloroquine treatment failures (combined early and late treatment failures) was higher in the central-eastern African countries (Tanzania, 53%; Uganda, 80%; Zambia, 57%) and Ecuador (54%) than in Ghana (36%). Using logistic regression, predictors of early treatment failure included younger age, higher baseline temperature, and greater levels of parasitaemia. We conclude that younger age, higher initial temperature, and higher baseline parasitaemia predict early treatment failure and a higher probability of worsening anaemia between admission and days 7 or 14 post-treatment.

Age Factors↗
PubMedDate not supplied

More on immigrants' earnings over time.

Immigrants' earnings have been found to be below those of natives in the earliest years after immigration, but with time in the US, earnings catch up with and then surpass those of natives. The authors obtain this result using an alternate data set, confirming the previous work of Barry Chiswick. The catch up period is between 20 and 30 years, later than Chiswick's result. After adding variables for foreign education and English ability, the catch up period is only 3 years after entry. In a context where other variables are not held constant, the authors consider effects of discrimination in admission by schooling and age. Both are found to be powerful selection factors in increasing the earnings levels of immigrants.

Americas↗
PubMedDate not supplied

The new biostatistics of resampling.

The statistical techniques reported in medical journals are often poorly understood and misused by researchers, and difficult for readers to comprehend. Even the relatively simple t test embodies an intricate collection of mathematical formulas such as the Normal approximation, with unintuitive elements such as pi and e. The researcher must consult a body of rules indicating whether a technique is applicable or inapplicable. If he or she does select a sound method and use it correctly, its mathematical complexity will still leave most readers in the dark. In most situations the resampling approach is at least as efficient as the formulaic method. It is transparently clear to the researcher and reader, and it protects the researcher from using the wrong formulaic technique. In this paper we will define the four steps in the resampling method, compare this procedure with standard formulaic treatment of the same data, and discuss the advantages of the resampling approach.

Adult↗