In USA, despite recent efforts to improve work zone safety, the number of crashes and fatalities at work zones has increased continuously over several past years. For addressing the existing safety problems, a clear understanding of the characteristics of work zone crashes is necessary. This thesis summarized a research study focusing on work zone traffic crash analysis to investigate the characteristics of work zone crashes and to identify the factors contributing to injury severity at work zones. These factors included roadway design, environmental conditions, traffic conditions and vehicle/driver features. Especially, special population groups, which divided into older, middle Age, and young, were inspected. This study was based on history crash data from the Florida State, which were extracted from the Florida CAR (Crash Analysis Reporting) system. Descriptive statistics method was used to find the characteristics of crashes at work zones. After then, an injury severity predict model, using the ordered probit regression technology, was developed to investigate the impacts of various factors on different the injury severity at work zones. From the model, it can be concluded that some factors, including the road section with curve, alcohol/drugs involved, a high speed, angle crash and too young or old drivers are more likely to increase the probability of angle crashes. Based on the magnitudes of the variable coefficients, the factor of maximum posted speed have a great impact to injury severity, which shows restriction to driving speed is principle countermeasure for improving work zone safety.

The aim of this thesis is to study the effect of smoking and drinking on wages in Sweden. The data used in this study is the Swedish Level-of-living survey (LNU) from 1991. A multinomial logit model and the marginal effects from the estimated model are used to study the effect of smoking and drinking on wages in Sweden. The empirical results conclude that medium drinking increases the probability of having a high income, i.e. there is a positive significant relationship between medium drinking and wages in Sweden. Also concluded from the empirical results is that there is not a significant relationship between smoking and wages in Sweden.

<p>The aim of this thesis is to study the effect of smoking and drinking on wages in Sweden. The data used in this study is the Swedish Level-of-living survey (LNU) from 1991. A multinomial logit model and the marginal effects from the estimated model are used to study the effect of smoking and drinking on wages in Sweden. The empirical results conclude that medium drinking increases the probability of having a high income, i.e. there is a positive significant relationship between medium drinking and wages in Sweden. Also concluded from the empirical results is that there is not a significant relationship between smoking and wages in Sweden.</p>

This study assesses the role of crossing locations and light conditions in pedestrian injury severity through a multivariate regression analysis to control for many other factors that also may influence pedestrian injury severity. Crossing locations include midblock and intersections, and light conditions include daylight, dark with street lighting, and dark without street lighting. The study formulates a theoretical framework on the determinants of pedestrian injury severity, and specifies an empirical model accordingly. An ordered probit model is then applied to the KABCO severity scale of pedestrian injuries which occurred while attempting street crossing in the years 1986 to 2003 in Florida. In terms of crossing locations, the probability of a pedestrian dying when struck by a vehicle, is higher at midblock locations than at intersections for any light condition. In fact, the odds of sustaining a fatal injury is 49 percent lower at intersections than at midblock locations under daylight conditions, 24 percent lower under dark with street lighting conditions, and 5 percent lower under dark without street lighting conditions. Relative to dark conditions without street lighting, daylight reduces the odds of a fatal injury by 75 percent at midblock locations and by 83 percent at intersections, while street lighting reduces the odds by 42 percent at midblock locations and by 54 percent at intersections.

The healthcare literature sometimes cites Medicare as a negative determinant of hospital profitability. However, a review of Florida acute care short-term general hospital data revealed a subset of profitable hospitals with high percentages of their revenue structure comprised of Medicare reimbursements. Some investigators might contend that these hospitals are just better managed; that hospital profitability is not related to patient mix or payer source. Although good management enhances financial health, there are perhaps other reasons why certain hospitals can become profitable with Medicare as their primary revenue source. Research findings indicate there is wide geographic variability shown for per-capita volumes of discretionary procedures reimbursed by Medicare, and broad variations in Medicare spending per enrollee for general acute care short-term hospitalizations. It was also found that many of the hospitals performing higher rates of discretionary procedures and showing the ability to make a profit with Medicare are investor owned. The focus of this study, covering years 2000-2005, was to examine two strategies using discretionary procedures under Medicare that Florida investor owned hospitals may employ to increase profitability and maintain long-term financial health. Part 1 of the study examined the association between long-term financial viability, measured by the total assets divided by total liabilities (TATL) ratio (the reciprocal of the debt ratio) and percentages per hospital of two discretionary cardiac and orthopedic procedure variables, reimbursed by conventional Medicare. A positive association was found between the TATL ratio and these variables, as well as significant marginal effects in the association between the TATL ratio and interaction terms for hospital ownership (where investor owned = 1 and not-for-profit = 0) and the discretionary cardiac procedure variable and ownership and the discretionary orthopedic procedure variable. Part 2 used total charges as the dependent variable for patient discharges reimbursed by Medicare HMO. It was found that investor owned hospitals generally assess significantly higher charges than not-for-profits for discretionary CABG and valve replacement procedures for patients with equivalent levels of medical services and hospitalization. It was also found that charges significantly increase for both investor-owned and not-for-profit hospitals located in the southern region of Florida.

No description available.

The main role of roadway lighting is to produce quick, accurate and comfortable visibility during nighttime conditions. It is commonly known that good lighting levels enable motorists, pedestrians and bicyclists to obtain necessary visual information in an effective and efficient manner. Many previous studies also proved that roadway lighting minimizes the likelihood of crashes by providing better visibility for roadway users. Appropriate and adequate roadway lighting illuminance levels for each roadway classification and pedestrian areas are essential to provide safe and comfortable usage. These levels are usually provided by national, or local standards and guidelines. The Florida Department of Transportation (FDOT) Plan Preparation Manual recommends a roadway lighting illuminance level average standard of 1.0 horizontal foot candle (fc) for all the roadway segments used in this research. The FDOT Plan Preparation Manual also states that this value should be considered standard, but should be increased if necessary to maintain an acceptable uniformity illuminance ratio. This study aimed to find the relationship between nighttime crash injury severity and roadway lighting illuminance. To accomplish this, the research team analyzed crash data and roadway lighting illuminance measured in roadway segments within the West Central Florida Region. An Ordered Probit Model was developed to understand the relationship between roadway lighting illuminance levels and crash injury severity. Additionally, a Negative Binomial Model was used to determine which roadway lighting illuminance levels can be more beneficial in reducing the counts of crashes resulting in injuries. A comprehensive literature review was conducted using longitudinal studies with and without roadway lighting. Results showed that on the same roadways there was a significant decrease in the number of nighttime crashes with the presence of roadway lighting. In this research, roadway lighting illuminance was measured every 40 feet using an Advanced Lighting Measurement System (ALMS) on a total of 245 centerline miles of roadway segments within the West Central Florida Region. The data were mapped and then analyzed using the existing mile post. During the process of crash data analysis, it was observed that rear-end collisions were the most common first harmful event observed in all crashes, regardless of the lighting conditions. Meanwhile, the average injury severity for all crashes, was found to be possible injury regardless of the lighting conditions (day, dark, dusk, and dawn). Finally, this research presented an Ordered Probit Model, developed to understand the existing relationship between roadway lighting illuminance levels and injury severity within the West Central Florida Region. It was observed that having a roadway lighting average moving illuminance range between 0.4 to 0.6 foot candles (fc) was more likely to have a positive effect in reducing the probability of injury severity during a nighttime crash. A Negative Binomial Model was conducted to determine if the roadway lighting average moving illuminance level, found on the Ordered Probit Model was beneficial in reducing crash injury severity during nighttime, would also be beneficial in reducing the counts of crashes resulting in injuries. It was observed that a roadway lighting average moving illuminance, range between 0.4 to 0.6 fc, was more likely to reduce the count of crashes resulting in injuries during nighttime conditions, thus increasing roadway safety. It was also observed that other factors such as pavement condition, site location (intersection or no intersection), number of lanes, and traffic volume can affect the severity and counts of nighttime crashes. The results of this study suggest that simply adding more roadway lighting does not make the roadway safer. The fact is that a reduction in the amount of roadway lighting illuminance can produce savings in energy consumption and help the environment by reducing light pollution. Moreover, these results show that designing roadway lighting systems go beyond the initial design process, it also requires continuous maintenance. Furthermore, regulations for new developments and the introduction of additional lighting sources near roadway facilities (that are not created with the intent of being used for roadway users) need to be created.

För att beslutsfattare och dagligvaruaktörer ska kunna fatta välgrundade beslut vid etablering av nya butiker är det viktigt att känna till hur demografiska faktorer påverkar dagligvarumarknaden. I denna uppsats analyserar vi med data för 2016 hur demografiska faktorer påverkar förekomsten av olika butikssegment på lokala marknader i Sverige samt hur demografi påverkar butikssegmentens omsättningsandelar. Segmenten skapades inom ramen för uppsatsen baserat på tidigare forskning och dagligvaruaktörernas egna butiksdefinitioner. Med logistiska regressioner på stadsdelsnivå finner vi (i) att en ökande andel befolkning med utrikes bakgrund påverkar sannolikheten positivt att minst en lågprisbutik finns etablerad i ett område, men påverkar sannolikheten att minst en traditionell mindre butik finns etablerad negativt. Vidare, med hjälp av OLS-regressioner på stadsdelsnivå finner vi (ii) att en högre andel befolkning med utrikes bakgrund påverkar lågprisbutikers andel av ett områdes totala omsättning positivt, men påverkar traditionella mindre butikers andel negativt. Till sist, indikerar resultatet (iii) att framförallt flödet av människor påverkar traditionella större butiker, både dess geografiska plats samt deras andel av ett områdes totala omsättning. På kommunnivå visar OLS-regressionerna delvis otydliga resultat, förmodligen till följd av allt för aggregerad data. Vår studie bidrar till den existerande litteraturen genom att analysera butiksetableringar och demografi i en svensk kontext. Tidigare forskning har främst undersökt den amerikanska och olika europeiska marknader. / It is important for policy makers and retail chains to recognise how demographics affect the non- durable goods business in order to make qualified decisions about establishing new grocery stores. In this thesis, using data from 2016, we analyse how demographics affect the presence of different store segments at local markets in Sweden and how it affects the turnover share of different store segments. The segments were defined as a part of this thesis and are based on previous literature and the concept description made by each included company. Using logit regressions on urban districts, we find (i) that a larger share of population with foreign background increases the probability that at least one discount store is established in the district but decreases the probability that at least one traditional small store is established. Further, using an OLS-regression on urban districts we find (ii) that a larger share of population with foreign background increases the share of total turnover in discount stores and decreases the share of total turnover for traditional small stores. Finally, our result indicates (iii) that the flow of people significantly affects traditional large stores, both regarding their presence on local markets as well as their share of the total turnover. When using municipalities as local markets, our OLS-regression provides partly indefinite results, probably a consequence of the aggregated data. Our thesis contributes to the existent literature by analysing store establishment and demography in a Swedish context. Previous literature has mainly evaluated American and European markets.

The institutional quality concept, advanced by academic literature as a mean to enhance output growth, suffer from the absence of a clear implementation strategy. Considering that developing countries usually lack resources to be able to afford large-scale universal institutional reforms, the lack of roadmap puts substantial obstacles to practical application of the given concept. This thesis therefore goes beyond the simple statement of institutional primacy and sets an objective to differentiate the institutional effects relative to the level of development. To test it empirically, fixed effects model is chosen and interaction terms between the measures of institutional quality and the share of middle class are employed. Obtained coefficients indicate that institutions promote economic growth only when middle class share exceeds 25%. At the same time, different aspects of institutional quality exhibit contradictory dynamics. The control of corruption becomes growth enhancing only when middle class constitutes over one third of the population, while the relevance of government effectiveness for economic growth on the contrary decreases with the enlargement of middle class. These findings confirm the presence of conditionality and deny the existence of universal recipe for institutional reforms. Implementation of better institutions based on context-specific approach would therefore bring greater results in terms of economic growth than the direct adoption of best-practice institutions, so intensively advanced by the World Bank and the IMF.