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127 Uppsatser om Variance Decomposition - Sida 4 av 9

"Låtom oss enligt gammal bömisk sed kasta ut dem genom fönstret!" : Historieläroböcker ur ett berättelseperspektiv

This thesis deals with the question of how and to what degree Swedish history books for schools changed between the early 20th century and the 1960s. The theoretical foundation for this study is a perspective which treats historical accounts as narratives, bringing meaning and orientation to the present. According to this perspective, historical accounts may be divided into four different types of narratives, traditional, exemplary, critical and genetical. The basis for this division is how the narratives use the past to make the present understandable.The following conclusions are reached:That Swedish history books for schools have changed less, and in a moore gradual way than those dealing with general history. There is a growing use of genetical narratives at the expense of mainly exemplary ones.

Utmattningssyndrom och KASAM. En möjlighet till en ökad känsla av sammanhang?

Some people who recovered from exhaustion disorder report that their lives feel more meaningful after the disease than before, despite residual symptoms and difficulties. This experience of increased meaningfulness has been linked to sense of coherence, SOC. The research question was whether individuals with exhaustion disorder at onset has a weak SOC, and if there is a general increase towards a higher SOC value ??during the recovery process. In a cross-sectional study, data were gathered on the SOC value via the SOC 29 form.

Elevers kunskaper i årskurs 3 om höstlöv och nedbrytningen i naturen.

Denna undersökning handlar om elevers kunskaper och uppfattningar angående höstlöven och nedbrytning i naturen. Studien har gjorts på två skolor i årskurs 3. Skola A har profilen ?Natur och Miljö? och skola B är en större skola utan profil. Syftet med arbetet är dels att kartlägga elevers föreställningar om nedbrytning i naturen och dels att undersöka hur man kan arbeta med ämnet i skolan för att få en god lärandemiljö.

Lanczos potentialer i kosmologiska rumtider

We derive the equation linking the Weyl tensor with its Lanczos potential, called the Weyl-Lanczos equation, in 1+3 covariant formalism for perfect fluid Bianchi type I spacetime and find an explicit expression for a Lanczos potential of the Weyl tensor in these spacetimes. To achieve this, we first need to derive the covariant decomposition of the Lanczos potential in this formalism. We also study an example by Novello and Velloso and derive their Lanczos potential in shear-free, irrotational perfect fluid spacetimes from a particular ansatz in 1+3 covariant formalism. The existence of the Lanczos potential is in some ways analogous to the vector potential in electromagnetic theory. Therefore, we also derive the electromagnetic potential equation in 1+3 covariant formalism for a general spacetime.

Arbetsmotivationens betydelse för engagemanget i en organisationsförändring

The purpose of this study was to examine the relation between self-determination theory and its three basic needs: competence, autonomy and relatedness, and commitment to change in an organizational change. Another purpose was to examine if the quality of the communication and the effects on the organization and way to work can predict commitment to change. Considering that organizational changes is very common today there is an interest to ease and improve the change process. The survey contained the scales Commitment to change scale and Basic need satisfaction at work scale and the participants were 39 office-workers who recently had gone through an organizational change. The result indicated that it?s possible to predict commitment to change from self-determination theory, communication and effects on organization and way to work.

Vad motiverar till ideellt arbete i ungdomsorganisationer?

Early studies of what motivates volunteering often have had an older sample and youth organizations have not been studied. A survey was used to study motives for volunteering in Swedish youth organizations. The importance of age and years of volunteering was studied. In the analysis 102 persons in age between 17 and 59 years participated. The participants ranked the motives as followed: knowledge, development, values, social, career and protection.

Effekter av kön, ålder och region på sjukpenningen i Sverige - en variansanalys

According to TCO (The Swedish Confederation for Professional Employees) the worst threat to the Swedish welfare is that so many people because of bad health and unemployment are not a part of the labour force. If Sweden could make the number of people with health and unemployment problems half the size as today, the GDP would increase with more than five percent. In real money this means 110 billion Swedish kronor a year. According to SCB (Statistics Sweden) the difference between women?s and men?s absence owing to illness should be investigated more closely in order to get at better understanding of the problem.

Odlingsstrategier på organogena jordar : en studie om beslutsfattande bland KRAV-anslutna lantbrukare

This study examines how farmers certified by KRAV face proposed regulations on organic soils put forward by KRAV economic association among others, and how they are affected economically. These soils are, from an environmental perspective, interesting as a target for production regulations as they cause greenhouse gas emissions through decomposition of organic material when cultivated. The regulations advocate that organic soils should be grown with pasture where soil cultivation is only allowed every fith year which implies that possible adjustments of cultivation have to be made in order to fulfill the regualtions. Collection of data have been made through a questionnaire sent out to 574 farmers certified by KRAV. The answers have been analysed using a decision making model and statistical findings suggest that proportion of organic soils, type of production, economic conditions and farmers? goals and values have an influence on whether the regulations and potential cultivation adjustments have been considered or not.

Kvinna & chef : samband mellan ledarstilar och kommunikationsformer

Similarities in earlier research between leadership styles and communication forms were found, partly concerning relations and partly concerning work assignments. Our approach was based on the notion that there could be a correlation between the manager2019s choice of communication mode (informal/formal) and leadership style i.e. Relation-Oriented Behaviour Leadership style/Task-Oriented Behaviour Leadership style. A gender perspective was used in the research. The method was quantitative with a questionnaire to women managers (N=78) in the private and the public sectors.

Elasticitetsmodulen i en kalkstabiliserad vägterrass : en fältstudie

Stabilization of subgrade is an internationally common technique to improve the characteristics of a soft soil. Improving the stiffness and bearing capacity of the subgrade enables the pavement to be designed with reduced depths of subbase and basecourse aggregates. This makes the stabilization technique both economically and environmentally interesting. Both natural and stabilized soils have high inherent property variability that should be considered when the characteristic value is derived. By analyzing the spatial variability in stabilized and natural subgrades it is possible get the parameters needed for reliability?based modeling of soil properties.

Optimal spelstrategi för yatzy

This report intends to analyze the difference between the original rules and a modification of the rules for the Scandinavian version of the world famous dice game yatzy (yahtzee). Several works are made previously existing strategies for yatzy and Yahtzee.The study was conducted using the optimal strategy calculated and implemented in the programming language Java. The execution of the application to create the file containing the optimal strategy was running on leased powerful servers from Amazon and took just over six hours each.A simulated player played 100,000 games based on the strategy, to obtain data which then was used to plot graphs and analyze the expected score and its standard deviation. The expected value (mean) and standard deviation of the score for the possibility of three or four throws were 233.00 ± 44.82 and 280.07 ± 41.25.In view of the results drawn the expected conclusion that the four possible throws provides increased probability of getting a high score, unlike the case where the player may only be able to throw the dice three times. The fact that the variance is lower in the case of four throw session is equivalent to that the likelihood to get close to the expected value increases..

Sol, jord och vatten. : Barns tankar om den ekologiska processen

Studies show that the interest and knowledge about science among teenagers is decreasing. They also reveal the difficulties to explain the ecological processes and that the ideas about the nature are collected from everyday life and early school years.The intention of this investigation was to find out more about children?s ideas and knowledge about the ecological processes and to compare these results with the curriculum.The method was a questionnaire and interviews with children in school year 1 ? 6. The aim of the studies was also to find out if any progress connected to age could be found, concerning understanding of the ecological processes.The results showed difficulties in achieving the predestined goals for biology and chemistry concerning ecology cycles and they differed a lot between the children. Often the learning process showed very little progress.

Reagera och agera: Styrka och snabbhet i den manuella responsen för emotionella stimuli

In this study I investigated whether the strength in the manual response for emotional and neutral stimulus search arrays can explain some of the difference in reaction times (RT:s) for emotional stimuli, or not. Earlier, perceptual, cognitive and attentional processes has mostly been used to explain the variance in RT:s. Thirtythree individuals were asked to, as fast as possible, detect a target picture among distractor pictures in 3 rows x 4 columns arranged search arrays. The pictures were categorized in fear relevant animals (snake, spider) and neutral animals (cat). The results showed, more correct responses for cat target.

Ants and termites in small-scale plantain farms in Uganda : a comparison between agroforestry and non-agroforestry farms

This study was conducted in Kkingo district, west of Masaka, Uganda. It compared soil macrofauna abundance in non-agroforestry farms with that of agroforestry farms. The agroforestry farms had participated in the Vi Agroforestry´s program between 1995 and 2006, and continued on their own after 2006, when Vi Agroforestry left the area. The soil macrofauna is important for soil structure and processes that are contributing to soil organ-ic matter decomposition and nutrient mineralization. They are also predators of potential pests.

Fonders avkastning - en variabelanalys av fonders avkastning under ekonomisk upp- och nedgång

Vårt syfte är att ta reda på mer om vad som påverkar fonders avkastning och om detta skiljer sig åt i ekonomisk uppgångs- respektive nedgångsperiod. För att uppfylla vårt syfte har vi valt att genomföra regressionsanalys med avkastning som beroende variabel och variablerna: standardavvikelse, beta, storlek, TKA och omsättningshastighet som förklarande variabler. Detta har genomförts i en ekonomisk uppgångs- och en ekonomisk nedgångsperiod. Vi har använt portföljvalsteori med dess ingående variabler avkastning och risk. Även begrepp som kovarians, korrelation, effektiva fronten, mean variance, CAPM och beta gås igenom.

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