171,065 research outputs found
Intertemporal Non-Separability or Borrowing Restrictions? : A Disaggregate Analysis Using the US Cex Panel
No full textCrime and Economic Incentives
No full textWe explore the role that economic incentives, particularly changes in wages at the bottom end of
the wage distribution, play in determining crime rates. We use data on the police force areas of
England and Wales between 1975 and 1996. We find that falls in the wages of unskilled workers
leads to increases in crime. We carry out a number of experiments with different wage measures,
including a wage measure that accounts for the effects of changes in the composition of
employment. These reinforce the picture of a strong impact of wages on crime. The result that
incentives play a central role is reinforced further by the strong impact on crime of deterrence
measures and of a measure of the returns to crime
Training disadvantaged youth in Latin America: evidence from a randomized trial
No full textYouth unemployment in Latin America is exceptionally high, as much as 50% among the poor. Vocational training may be the best chance to help unemployed young people at the
bottom of the income distribution. This paper evaluates the impact of a randomized training program for disadvantaged youth introduced in Colombia in 2005 on the
employment and earnings of trainees. This is one of a couple of randomized training trials conducted in developing countries and, thus, offers a unique opportunity to examine the causal impact of training in a developing country context. We use originally collected data on individuals randomly offered and not offered training. We find that the program raises earnings and employment for both men and women, with larger effects on women. Women offered training earn about 18% more than those not offered training, while men offered training earn about 8% more than men not offered training. Much of the earnings increases for both men and women are related to increased employment in formal sector jobs following training. The benefits of training are greater when individuals spend more time doing on-the-job training, while hours of training in the classroom have no impact on the returns to training. Cost-benefit analysis of these results suggests that the program generates a large net gain, especially for women
Labor supply models: unobserved heterogeneity, nonparticipation and dynamics
No full textThis chapter is concerned with the identification and estimation of models of labor supply. The focus is on the key issues that arise from unobserved heterogeneity, nonparticipation and dynamics. We examine the simple ‘static’ labor supply model with proportional taxes and highlight the problems surrounding nonparticipation and missing wages. The difference in differences
approach to estimation and identification is developed within the context of the labour supply model. We also consider the impact of incorporating nonlinear taxation and welfare programme participation. Family labor supply is looked at from botht e unitary and collective persepctives.
Finally we consider intertemporal models focusing on the difficulties that arise with participation and heterogeneity
Training Disadvantaged Youth in Latin America: Evidence from a Randomized Trial
No full textYouth unemployment in Latin America is exceptionally high, as much as 50% among the poor. Vocational training may be the best chance to help unemployed young people at the bottom of the income distribution. This paper evaluates the impact of a randomized training program for disadvantaged youth introduced in Colombia in 2005 on the employment and earnings of trainees. This is one of a couple of randomized training trials conducted in developing countries and, thus, offers a unique opportunity to examine the causal impact of training in a developing country context. We use originally collected data on individuals randomly offered and not offered training. We find that the program raises earnings and employment for both men and women, with larger effects on women. Women offered training earn about 18% more than those not offered training, while men offered training earn about 8% more than men not offered training. Much of the earnings increases for both men and women are related to increased employment in formal sector jobs following training. The benefits of training are greater when individuals spend more time doing on-the-job training, while hours of training in the classroom have no impact on the returns to training. Cost-benefit analysis of these results suggests that the program generates a large net gain, especially for women.
A retrospective on Friedman’s Theory of Permanent Income
No full textFriedman’s book on the “Consumption Function” is one of the great works of Economics
demonstrating how the interplay between theoretical ideas and data analysis could lead to
major policy implications. We present a short review of Friedman’s Permanent Income
Hypothesis, the origins of the idea and its theoretical foundations. We give a brief
overview of its influence in modern economics and discuss some relevant empirical
results and the way they relate to the original approach taken by Friedman
Education subsidies and school drop-out rates
No full textThis paper evaluates whether means-tested grants paid to secondary students are an effective way of reducing the proportion of school dropouts. We look at this problem using matching techniques on a pilot study carried out in England during 1999 and 2000 using a specially designed dataset that ensures that valid comparisons between our pilot and control areas are made. The impact of the subsidy is quite substantial with initial participation rates (at age 16/17) being around 4.5 percentage points higher. Full-time participation rates one year later are found to have increased by around 6.4 percentage points which is largely due to the EMA having a significant effect on retention in post compulsory education. These effects vary by eligibility group with those receiving the full payment having the largest initial increase in participation, whilst the effects for those who are partially eligible are only significantly different from the control group in the second year of the program. There is some evidence that the participation rate effect is stronger for boys, especially in the second year, and that the policy goes some way to reducing the gap in dropout rates between boys and girls. It is also clear that the policy has the largest impact on children from the poorest socio-economic background.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Econometric methods for research in education
No full textThis paper reviews some of the econometric methods that have been used in the economics of education. The focus is on understanding how the assumptions made to justify and implement such methods relate to the underlying economic model and the interpretation of the results. We start by considering the estimation of the returns to education both within the context of a dynamic discrete choice model inspired byWillis and Rosen (1979) and in the context of the Mincer model. We discuss the relationship between the econometric assumptions and economic behaviour. We then discuss methods that have been used in the context of assessing the impact of education quality, the teacher contribution to pupils' achievement and the effect of school quality on housing prices. In the process we also provide a summary of some of the main results in this literature.
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
- …
