Timothy F. Leslie

Identification and Differentiation of Urban Centers in Phoenix Through a Multi-Criteria Kernel-Density Approach

Research concerning geographical centers of economic activity has sought to explain patterns of development and interaction in cities. This article presents a new method of defining intraurban centers within a spatial economic framework as a combination of both employment and establishment kernel-smoothed patterns. The method is applied in Phoenix, a postmodern metropolis that has grown by more than a factor of thirty between 1950 and 2005 and is one of the largest and fastest growing metropolitan areas in the United States. Centers are found to vary considerably in their sectoral composition and are grouped based on their focus of secondary, retail, or high-order emphasis. A conditional logit model is used to show how each center differentiates with regard to establishment size and sector as well as the importance of center characteristics.

Spatial Convergence and Spillovers in American Invention

Abstract Endogenous growth theory places spatial knowledge spillovers at the center of national technological progress. Advances in spatial autocorrelation and regression analyses provide methods to assess the influence of these spillovers on the geographical distribution and growth of invention. This article investigates interstate inequality and convergence in per capita patenting in the United States in the period 1963–2003. We analyze both the complete forty years and trends in ten-year intervals. Morans I reveals spatial dependence in patenting levels and growth, and LISA cluster maps identify regional groupings of leading and trailing states. Our regression results show that both regional effects and spatial spillovers influence convergence rates, which were low and steady in the thirty years before 1993. In the subsequent decade, patenting expansion concentrated in a few states, inequality increased, and divergence ensued. Western states, in general, and the Pacific Northwest, in particular, increasingly dominate patent growth. Rank order correlation analyses show that convergence before 1993 was driven by catch-up and not by leapfrogging. A final regression analysis shows that patent growth rates in the 1993–2003 interval were higher in more rural states and in those with high proportions of payrolls generated by high-technology manufacturing and producer services industries. States in the South significantly lagged. Our results support the hypothesis that creative skilled professionals seek to reside in states that offer both well-paying jobs in high-technology manufacturing and producer services sectors and easy access to rural outdoor recreation and leisure amenities.

Producer Services in the Urban Core and Suburbs of Phoenix, Arizona

Recent research shows growing concentration of corporate decision-making functions in metropolitan cores and strong relationships between managerial activities and producer services. The paper investigates the location of 12 disaggregated producer service sectors in Phoenix, Arizona. Concentration of legal, accounting and computer services underpin the economy of the inner core. Second-order unweighted and employment-weighted distance-based clustering of establishments in each sector are calculated. Clustering of legal establishments is particularly high and there is a consistent pattern of higher clustering levels among the larger establishments of most sectors. Establishment size in several sectors is inversely related to distance from the centre. These results are interpreted as evidence that large establishments are drawn to central locations to exploit information externalities. Concentration in the inner core, clustering and the sensitivity of establishment size to distance from the CBD are significantly correlated.

Sociodemographic Predictors of Vaccination Exemptions on the Basis of Personal Belief in California

OBJECTIVES We examined the variability in the percentage of students with personal belief exemptions (PBEs) from mandatory vaccinations in California schools and communities according to income, education, race, and school characteristics. METHODS We used spatial lag models to analyze 2007-2013 PBE data from the California Department of Public Health. The analyses included school- and regional-level models, and separately examined the percentage of students with exemptions in 2013 and the change in percentages over time. RESULTS The percentage of students with PBEs doubled from 2007 to 2013, from 1.54% to 3.06%. Across all models, higher median household income and higher percentage of White race in the population, but not educational attainment, significantly predicted higher percentages of students with PBEs in 2013. Higher income, White population, and private school type significantly predicted greater increases in exemptions from 2007 to 2013, whereas higher educational attainment was associated with smaller increases. CONCLUSIONS Personal belief exemptions are more common in areas with a higher percentage of White race and higher income.

POSTINDUSTRIAL MANUFACTURING IN A SUNBELT METROPOLIS: WHERE ARE FACTORIES LOCATED IN PHOENIX?

Manufacturing establishments are integral to the spatial structure of fast-growing Sunbelt metropolitan areas, but most concepts and theories of intrametropolitan location were largely developed for an earlier technological era and different spatial contexts. This article investigates the location of nine disaggregated manufacturing sectors in Phoenix, Arizona, showing varying degrees of central core concentration and metropolitan-wide clustering. Distinct sectoral co-location patterns are also evident. We interpret our results as evidence that the intrametropolitan location of postindustrial manufacturing is best understood as a series of spatial distributions with varying concentration, centralization, clustering, and other order-based characteristics. There is little evidence that randomly scattered discrete industrial zones have developed nor that spatial patterns are uniform. Enduring lock-in effects tied to transportation infrastructure are pivotal to understanding the locational distribution of manufacturing industries in metropolitan Phoenix. Results do not support a hypothesis that a positive relationship exists between establishment size and distance from sectoral mean centers.

Spatial Pattern and Order in Sunbelt Retailing: Shopping in Phoenix in the Twenty-First Century

Understanding the complexity of store location in sprawling polycentric cities requires exploitation of new spatial analysis methods that can decipher patterns in georeferenced point data. This article shows how the intrametropolitan location of retailing is best understood as a series of interconnected spatial distributions with varying order-based characteristics. A scattered pattern, which initially appears random or chaotic, is a web of differentiated spatial regimes containing wide-ranging order. A variety of clustering and colocation methods are used to uncover spatial patterns of retailing in Phoenix, Arizona. The analysis simultaneously identifies establishment associations and disassociations within and across sectors. Results show that clothing and motor vehicles are the most likely to cluster next to establishments in the same sector. These sectors also have strong intersectoral relationships across retailing. We find limited evidence that the size of establishments significantly increases with distance from sectoral mean centers. Geospatial technologies are increasingly used by individual retailers to locate and manage their facilities. It is important that scholarly analysis of retailing spatial patterns keeps pace, especially as cities grow and land use and land value patterns become more complex.

Change in Medical Exemptions From Immunization in California After Elimination of Personal Belief Exemptions

Change in Medical Exemptions From Immunization in California After Elimination of Personal Belief Exemptions California Senate bill (SB) 277 eliminated the personal belief exemption (PBE) provision from the state’s school-entry vaccine mandates prior to the 2016-2017 school year. Previously, vaccine-hesitant parents could acquire a PBE for their child based on philosophical or religious beliefs. Now, the only pathway for an unvaccinated kindergartener to enter a public or private school in California is with a medical exemption (ME), which requires a written statement from a licensed physician describing the medical reasons that immunization is unsafe.1 Previously, MEs were only granted to children with a contraindication to vaccination; however, SB 277 gave physicians broader discretion to grant MEs for reasons other than a contraindication, including family medical history.2,3 One concern voiced after the passage of SB 277 was whether vaccine-hesitant parents would seek MEs as replacements for PBEs and would find physicians willing to oblige them.4 We evaluated the statewide change in MEs in the first year under SB 277 and whether MEs increased in regions with high PBE use prior to its enactment. Methods | We used publicly available data from the California Department of Public Health’s yearly Kindergarten Immunization Assessment reports. Each year, all schools are required to submit kindergarten enrollment, vaccination, and exemption data; more than 95% of all kindergarteners are represented in the yearly reports, which include statewide and county-level data. We extracted the statewide ME and PBE percentages for incoming kindergarteners from 1996 to 2016. We calculated and mapped the 1-year change in ME percentage (2015 to 2016) for counties and used Pearson correlation to test whether county-level change in ME percentage was associated with PBE use in the year prior to the implementation of SB 277. We used ArcGIS (Esri), version 10.3, for mapping and R (R Foundation), version 3.3.2, for the correlation test.

Distribution and determinants of young child feeding practices in the East African region: demographic health survey data analysis from 2008-2011

We utilized the most recent Demographic Health Survey data to explore the distribution of feeding practices and examine relationships between complementary feeding and socio-demographic and health behaviour indicators in Kenya, Uganda and Tanzania. We based our analysis on complementary dietary diversity scores calculated for children 6-23 months old. Geographically, Kenya displayed clear division of children’s diet diversity scores across its regions, unlike Uganda and Tanzania. Less than 40% of the children’s meal frequencies in Uganda and Tanzania had met the minimum daily recommended levels. Only 30-40% of children in Kenya, Tanzania and Uganda had consumed diets with adequate diversity. Children’s age, breastfeeding status, mother’s education level and working status, household wealth index, prenatal care visits, receiving vitamin A supplements, using modern contraceptives and meal frequencies were significantly associated with adequate complementary food diversity in at least one of the three countries included in the current analyses. These analyses contribute to a better understanding and targeting of infant and young child feeding within the East African region.

Geographic distribution and socio-economic determinants of women's nutritional status in Mali households.

OBJECTIVE Mali is one of the poorest countries in Africa, with 72% of its population surviving on less than

California Senate Bill 277’s Grandfather Clause and Nonmedical Vaccine Exemptions in California, 2015-2022

US 1.00 per day. Health and demographic indicators are bleak. With few exceptions, studies related to the health of women in Mali have largely been under-represented. In addition, in recent years a new type of malnutrition stemming from weight gain and obesity has been observed throughout Africa. The present study aimed to (i) describe geographic and health variations of women of reproductive age, (ii) describe geographic variations of household salt iodine levels and (iii) investigate potential factors associated with women’s anthropometric status and use of adequately iodized salt among households in Mali. DESIGN Demographic and Health Survey data, multistage-stratified cluster sampling methodology. SETTING Rural and urban areas of Mali. SUBJECTS Non-pregnant women (n 6015) between the ages of 19 and 44 years. RESULTS Nineteen per cent of the women were overweight or obese while 11% were underweight. Seventy-eight per cent of the households utilized adequately iodized salt. Underweight women were more prevalent in southern Mali, while obesity was more frequent in the north-east and within the major urban areas. Households located within the southern parts of Mali were more likely to utilize adequately iodized salt. Education, age, modern contraceptive use, breast-feeding status at time of the survey and household wealth index were significantly associated with the women’s BMI or households’ use of adequately iodized salt. CONCLUSIONS The combined use of statistical and geographic system analysis contributes to improve targeting of interventions among vulnerable populations.