Child Care Costs and the Employment Status of Married Australian Mothers

Using data from the HILDA (Household Income and Labour Dynamics), this paper examines the implications of child care costs on maternal employment status by distinguishing between full-time and part-time work. Our empirical approach uses an ordered probit model taking into account the endogeneity associated with both wages and child care costs. Results indicate that child care costs have a statistically insignificant effect on the decision to work either full time or part time. Moreover, the reported elasticities of part-time and full-time work with respect to child care costs are relatively low. This suggests that the significant subsidies paid to users of child care may have a limited role in increasing the labour market activity of married mothers.female labour supply, child care, part-time, full-time

Prices and Poverty in Urban Ethiopia

Poverty is an ongoing issue in Ethiopia. The identification of policy options to address the problem primarily requires that poverty be measured accurately. One of the most important ingredients in the measurement of poverty are prices. The magnitude of poverty is affected by how cost of living differences across time and regions are adjusted. This paper derives a set of price indices for Urban Ethiopia using data from four urban household surveys conducted in 1994, 1995, 1997, and 2000. The results show that the cities of Dire Dawa and Mekelle are the two most expensive cities, while Jimma and Bahir Dar are the least expensive. The findings also confirm that poverty is indeed high in urban Ethiopia with poverty head count of over 40 percent. Poverty estimates derived using country level consumer price indexes, which do not adjust for spatial cost of living differences, are misleading. But using poverty lines as deflators to account for price differences does not affect the poverty estimates obtained.Poverty; Urban Ethiopia; Price indexes

Confidentially is not enough: framing effects in student evaluation of economics teaching

Contrary to previous research we show lack of anonymity is associated with large positive shifts in student evaluation of teaching. The results are consistent with the simple observation that due to higher expected future earnings economics and business students have more at stake in terms of potential retaliation by an instructor. The observed positive bias is strongest for international students. Our analysis is based on both a comparison of distributions and ordered probit multi-variate regression. These methods overcome the statistical problems associated with previous studies which looked at differences in means for ordinal responses.

Prices and Poverty in Urban Ethiopia

Poverty is an ongoing issue in Ethiopia. The identification of policy options to address the problem primarily requires that poverty be measured accurately. One of the most important ingredients in the measurement of poverty are prices. The magnitude of poverty is affected by how cost of living differences across time and regions are adjusted. This paper derives a set of price indices for Urban Ethiopia using data from four urban household surveys conducted in 1994, 1995, 1997, and 2000. The results show that the cities of Dire Dawa and Mekelle are the two most expensive cities, while Jimma and Bahir Dar are the least expensive. The findings also confirm that poverty is indeed high in urban Ethiopia with poverty head count of over 40 percent. Poverty estimates derived using country level consumer price indexes, which do not adjust for spatial cost of living differences, are misleading. But using poverty lines as deflators to account for price differences does not affect the poverty estimates obtained

Housing Wealth and Household Consumption: New Evidence from Australia and Canada

Over the past two decades a number of countries have experienced an increase in house prices at the same time that aggregate consumption has been observed to increase. Alternative hypotheses have been put forward to explain this pattern. In this paper we test these hypotheses by using repeated Household Expenditure Surveys from Canada and Australia to identify the transmission mechanism that links consumption and household wealth. The empirical analysis suggests that neither a direct wealth effect nor a common causal factor is a likely explanation for the observed correlation between wealth and consumption. Rather, indirect factors such as relaxation of credit constraints are more likely explanations

A novel model-based 3D+time left ventricular segmentation technique

A common approach to model-based segmentation is to assume a top-down modelling strategy. However, this is not feasible for complex 3D+time structures such as the cardiac left ventricle due to increased training requirements, aligning difficulties and local minima in resulting models. As our main contribution, we present an alternate bottom-up modelling approach. By combining the variation captured in multiple dimensionally-targeted models at segmentation-time we create a scalable segmentation framework that does not suffer from the ’curse of dimensionality’. Our second contribution involves a flexible contour coupling technique that allows our segmentation method to adapt to unseen contour configurations outside the training set. This is used to identify the endo- and epi-cardium contours of the left ventricle by coupling them at segmentationtime, instead of at model-time. We apply our approach to 33 3D+time MRI cardiac datasets and perform comprehensive evaluation against several state-of-the-art works. Quantitative evaluation illustrates that our method requires significantly less training than state-of-the-art model-based methods, while maintaining or improving segmentation accuracy

Segmenting the left ventricle in 3D using a coupled ASM and a learned non-rigid spatial model

This paper presents a new approach to higher dimensional segmentation. We present an extended Active Shape Model (ASM) formulation for the segmentation of multi-contour anatomical structures. We employ coupling and weighting schemes to improve the robustness of ASM segmentation. 3D segmentation is achieved through propagation of a 2D ASM using a learned non-rigid spatial model. This approach does not suffer from the training and aligning difficulties faced by direct 3D model-based methods used today. Experimental results are encouraging at this early stage, and future directions of research are provided

The Decline of the Self-Employment Rate in Australia

This paper using the Australian panel data(HILDA) investigates the declining trend of self-employment rate in Australia, a pattern observed in a number of other developed countries in the 2000s. We focus on the entry into and the exit from self-employment, treating males and females separately. Our results show that the self-employment rate has declined in Australia because older workers, especially older female workers, remained longer in paid-employment. This finding indicates that although the self-employment rate of older workers is higher than that of younger workers, the gap has decreased in recent years so that the average self-employment rate has declined. In addition, we provide some evidence that industry and institutional changes, such as reforms in tax and pension systems, may have contributed to an increase in the labour force participation of older females, which may explain why the decline of self-employment has been severe for this group

Tropical Mosquito Assemblages Demonstrate ‘Textbook’ Annual Cycles

Background: Annual biological rhythms are often depicted as predictably cyclic, but quantitative evaluations are few and rarely both cyclic and constant among years. In the monsoon tropics, the intense seasonality of rainfall frequently drives fluctuations in the populations of short-lived aquatic organisms. However, it is unclear how predictably assemblage composition will fluctuate because the intensity, onset and cessation of the wet season varies greatly among years. Methodology/Principal Findings: Adult mosquitoes were sampled using EVS suction traps baited with carbon dioxide around swamplands adjacent to the city of Darwin in northern Australia. Eleven sites were sampled weekly for five years, and one site weekly for 24 years, the sample of c. 1.4 million mosquitoes yielding 63 species. Mosquito abundance, species richness and diversity fluctuated seasonally, species richness being highly predictable. Ordination of assemblage composition demonstrated striking annual cycles that varied little from year to year. The mosquito assemblage was temporally structured by a succession of species peaks in abundance. Conclusion/Significance: Ordination provided strong visual representation of annual rhythms in assemblage composition and the means to evaluate variability among years. Because most mosquitoes breed in shallow freshwater which fluctuates with rainfall, we did not anticipate such repeatability; we conclude that mosquito assemblage composition appears adapte