Sökresultat

Linear regression is a standard tool for numerical prediction, but there are several estimators to choose from, and this choice can greatly affect prediction accuracy. This thesis empirically explores how the out-of-sample predictive performance of ordinary least squares (OLS), ridge regression (Ridge), and the lasso (Lasso) is affected by varying key model conditions, given a baseline setting. Fo

This study tests whether the Ricardian Equivalence Hypothesis holds in Sweden when the private sector faces an intertemporal budget constraint skewed by the media narrative. Time series analysis of cointegrated vector autoregressive processes is utilized to identify Ricardian consumer behavior in three different models, in order to find differences in consumer behavior when media narrative bias is

The modified fighting hypothesis (MFH) proposes that most humans are right-handed because it conveyed an advantage during intraspecific fights with sharp weapons, due to the leftward location of the heart and aorta. An examination of the literature on sharp force injury showed that the thoracic region is penetrated more than any other region, and the left thorax is penetrated approximately 2.4 tim

The Circular Economy (CE) concept is widely promoted as a pathway to sustainability, yet its practical realization can appear to be challenging and unclear due to divergent definitions, interpretations and understanding about the implications and goals of a realized CE. Addressing this gap, this study develops the Circular Economy Loop Strategies (CELS) Framework, a synthesizing foundational model

Mood, an individual’s emotional state, fundamentally shapes how the brain interprets sensory input by providing a continuous affective context for prediction and evaluation. In language processing, mood may bias the interpretation of emotionally valenced words, amplifying or dampening their perceived affect. Yet, the temporal dynamics of these mood-valence interactions remain poorly understood. To

The sum of a random number of independent and identically distributed random vectors has a distribution which is not analytically tractable, in the general case. The problem has been addressed by means of asymptotic approximations embedding the number of summands in a stochastically increasing sequence. Another approach relies on fitting flexible and tractable parametric, multivariate distributionThe sum of a random number of independent and identically distributed random vectors has a distribution which is not analytically tractable, in the general case. The problem has been addressed by means of asymptotic approximations embedding the number of summands in a stochastically increasing sequence. Another approach relies on fitting flexible and tractable parametric, multivariate distribution

State-of-the-art attosecond photoionization experiments are identified as a new platform to test Born’s rule—a postulate of quantum mechanics. A simulation of the so-called Sorkin test under typical experimental conditions infers an achievable measurement precision in the range of the best Sorkin tests to date, demonstrating new opportunities for high-precision tests of Born’s rule via nonlinear m

This thesis investigates core excited electronic states of molecules in gas phase. In particular, the resonanttransitions of ionised molecules, the site-selectivity surrounding Auger-Meitner decay, and the nuclear dynamicsthat may follow core excitation and ionisation.Background: Fundamental understanding of molecules and ions lay the groundwork for all future applicativescience and production. Fo

Background: Insulin resistance and impaired insulin secretion are hallmarks of type 2 diabetes (T2D) and may influence risks of complications including dementia. We investigated dementia risk across T2D subgroups defined by beta-cell function and insulin sensitivity. Methods: We used Homeostasis Model Assessment-2 indices of beta-cell function (HOMA2-B) and insulin sensitivity (HOMA2-S) to classif

This study clarifies when Bayesian analysis provides a practical advantage, particularly in large-area searches, hazardous or inaccessible environments, and low signal-to-noise ratio (SNR) scenarios where direct source approach is not feasible. We present a PyMC-based Bayesian framework for localizing a single unshielded gamma-emitting source and estimating its activity, with the ability to switch

Entrepreneurship represents a potential pathway for refugees’ social and economic integration, yet existing research provides limited insight into the roles of entrepreneurial dispositions and perceptions of host-country institutions in shaping refugees’ readiness to initiate start-up activities. Drawing on survey data from Ukrainian refugees in Sweden (n = 92), this study examines the effects of

Kan man leva på en ödegård? Uppenbarligen har man inte kunnat det eftersom flera medeltida gårdar efter pesten och den medeltida agrarkrisen förblev öde. Svaret på frågan är avhängigt inte bara arealer, klimat och jordar utan i lika stor utsträckning sociala förhållanden och odlingssystem. Den kan alltså omformuleras till: På vilka villkor kan en given yta tjäna som underlag för ett hushåll?Detta

This chapter provides a critical review of geographical research on informal education. We trace how understandings of informal education have been enriched in recent years through geographical concepts and original research. We use this chapter to call on geographers to move from what have tended to be isolated studies of informal education in a national context – whether in the global North (pre

This paper addresses the positive synchronization of interconnected systems on undirected graphs. For homogeneous positive systems, a static feedback protocol design is proposed, based on the Linear Regulator problem. The solution to the algebraic equation associated to the stabilizing policy can be found using a linear program. Necessary and sufficient conditions on the positivity of each agent's