Spelling suggestions: "subject:"interrupted timeseries design"" "subject:"interrupted timehistories design""
1 |
Utvärdering av mötesfria vägar : Analys av olyckor på mötesfria vägar i Karlstadsregionen / Evaluation of median barriers : Analysis of accidents on roads with median barriers in the Karlstad regionKylén, Linda January 2014 (has links)
Sedan år 1998 har det i Nollvisionens fotspår startats ett utvecklingsprogram i Sverige som syftar till att omvandla gamla 13 meters landsvägar och motortrafikleder till mötesfria. Implementeringen var tänkt att påtagligt reducera antalet mötes- och omkörningsolyckor samt singelolyckor med svåra konsekvenser i form av svårt skadade och dödade utan att försämra trafiksäkerheten i övrigt. Syftet med denna studie är att göra en effektmätning av de mötesfria vägarnas införande i Karlstadsregionen samt att göra en sammanställning av de olycksrisker mötesfria vägar omfattas av. Frågeställningarna som används i studien är: - Har det blivit säkrare på vägarna sedan implementeringen av mötesfria vägar i Karlstadsregionen? - Hur sker olyckor på mötesfria vägar inom Karlstadsregionen? För att beskriva hur olyckor sker på mötesfria vägar inom Karlstadsregionen har en deskriptiv analys tillämpats som grundats på de beskrivningar av händelseförlopp som dokumenterats i STRADA och CORE, mellan åren 2010-2013. För att avgöra huruvida vägarna blivit säkrare sedan implementering tillämpades en segmenterad linjär regressionsanalys där antalet personskadeolyckor studerats, tre år innan och tre år efter ombyggnad för respektive vägavsnitt. Singel- och upphinnandeolyckor var de dominerande olyckstyperna på mötesfria vägar i Karlstadsregionen mellan åren 2010-2013 då de sammanlagt stod för 72,3% av samtliga olyckor som medfört skada. Vid kategoriseringen av huvudorsak till olycka framgick det att 42% av alla olyckor kan spåras till brister i samspel mellan trafikanter och väderförhållanden bedömdes i 24,1% av fallen vara huvudorsak till olycka. Den statistiska analysen var inte signifikant, men gav indikation på att vägarna blivit säkrare sedan implementering då trenden för samtliga skadade minskat. / In the footsteps of Vision Zero, a development program in Sweden was initiated in 1998. The program aimed to increase road safety on existing 13-meter roads and express roads by implementing median barriers. The purpose of this study is to measure the impact of the transformed roadways in the Karlstad region and to examine the different types of accident risks the roadways are covered by. The research questions used are: - Has the implementation of median barriers in the Karlstad region contributed to safer roads? - How do accidents occur on roads with median barriers? To describe how accidents occur on roads with median barriers in Karlstad region a descriptive analysis was made by the description of event that is documented in STRADA and CORE, between the years 2010-2013. To determine whether the roads became safer after implementation a segmented linear regression analysis was applied. Accidents resulting in injury were examined, three years before and three years after reconstruction for each road section. Single-vehicle accidents and rear-end collisions were the dominating accident types on roadways with median barriers in the Karlstad region between the years 2010-2013. They together accounted for 72,3% of all accidents that resulted in injury. When the main cause of accident was examined, it emerged that 42% of all accidents could be traced to deficiencies in the interaction between road users. Weather conditions were estimated to be the main cause of accident in 24,1% of all the studied cases. The statistical analysis was not significant, but indicated that the roads became safer after the implementation since the observed trend for all types of injured decreased.
|
2 |
The effect of a nuclear family's sudden loss on the personality structures of individual family membersMarais, Adele 13 November 2008 (has links)
The purpose of this study was to gain an understanding of the potential effect of sudden loss on the personality structures of bereaved individuals. For this purpose, I focused on the individual personality structures of five nuclear family members during the first year following the sudden loss of their daughter/sister. I followed a concurrent nested mixed model research approach and relied upon both the post-positivist and interpretivist paradigms, allowing me to integrate the complementary strengths of quantitative and qualitative data collection by means of triangulation. I utilised a within group interrupted time series design, comparing the family’s MBTI® profiles prior to and following the sudden loss they had experienced. In addition, I incorporated the results of 16PF profiles of the participants administered post-sudden loss. I further substantiated my findings in terms of recurring themes on individual metaphors concerning the sudden loss experience, constructed by the participants. The findings of the study indicated that distinct changes in personality structures occurred in terms of the personality structures of the participants. Pertaining to the four polarities of the MBTI®, I found that the participants displayed a greater preference for the Introversion attitude, as well as both the Sensing and Feeling functions, after they had experienced sudden loss. All participants displayed an inclination towards personal growth by moving closer to the Judging/Perceiving axis post-sudden loss. In addition, two general tendencies were evident amongst the participants, namely a greater dependence on the inferior functions; and secondly the tendency to rely on type exaggeration when dealing with sudden loss. / Dissertation (MEd)--University of Pretoria, 2008. / Educational Psychology / unrestricted
|
3 |
Fransk neo-kolonialism i Afrika : En hypotetisk deduktiv studie av CFA-francens inverkan påbeteende hos kapitalägare i Guinea-Bissauutifrån Public Choice-teorinSjöquist Wikström, Jesper January 2023 (has links)
This research paper addresses the compelling intersection of economic behavior and neo-colonial structures, specifically within the context of the CFA Franc currency union. The central issue under examination is the impact of the CFA Franc agreement on the behavior of capital owners in Guinea-Bissau. The purpose of this study is to understand the complex interplay between economic actions and neo-colonial mechanisms, tested via two hypotheses derived from Public Choice theory and the CFA agreement, and further relate the findings to the discourse on neo-colonialism. The study employs an Interrupted Time Series (ITS) design and Time Series Analysis (TSA) to systematically explore changes over time and assess the cause-effect relationships in a realistic manner. Findings partially confirm the hypothesis regarding foreign reserves, indicating that the CFA agreement indeed impacts capital owners' behavior. However, contrary to expectations, capital flight was found to decrease post-intervention, suggesting additional factors at play. The results illuminate the complex dynamics of the CFA union and broaden the understanding of potential neo-colonial structures, contributing to the ongoing debate on economic inequality and neo-colonialism.
|
Page generated in 0.1091 seconds