Sök:

Sökresultat:

82 Uppsatser om Mean-variance - Sida 2 av 6

Populationsstruktur och genetisk analys av exteriöra egenskaper hos svensk ardenner :

The purposes of this study were to estimate genetic and phenotypic parameters for conformation traits in Swedish Ardenner, a heavy draught horse, and to investigate the inbreeding status of the population. Additionally, a breeding scheme proposal was created, based on the results achieved in the study. The data studied were obtained from the Swedish Horse Board and from the Swedish Ardenner Association. The data included 1632 three-year-old horses, mainly mares, and 356 stallions, judged between 1986 and 2005 at conformation shows. The traits studied were type, head-neck-body, legs, walk and trot at hand, total score and height at withers.

Frosttolerans hos douglasgran av olika ursprung och tillväxttyp

This report evaluates whether normal approximation or resampling is to prefer for estimating the distribution of the sample mean and functions of the sample mean. The evaluation relies on simulation studies. The observations of the sample are allowed to be differently distributed. In the case of sample means they are also allowed to be dependent.For sample means the two approximations behaves very similar. The most important component whether we have a good or a bad approximation is how good the approximations catch the variance of the true distribution.

Statistisk analys av barnpsykiatrisk symptomatologi som ökar risken för senare personlighetsstörning

This report evaluates whether normal approximation or resampling is to prefer for estimating the distribution of the sample mean and functions of the sample mean. The evaluation relies on simulation studies. The observations of the sample are allowed to be differently distributed. In the case of sample means they are also allowed to be dependent.For sample means the two approximations behaves very similar. The most important component whether we have a good or a bad approximation is how good the approximations catch the variance of the true distribution.

Makroekonomiska variablers påverkan på Dow Jones och OMXS30

Syftet med studien är att undersöka makroekonomiska variablers effekt på Dow Jones och OMXS30, med hjälp av en lämplig ekonometrisk modell. Vidare är syftet att analysera möjligheten för börsprognostisering och analysera om denna möjlighet är lika stor för Dow Jones som för OMXS30. Detta kommer att ske genom att undersöka motsvarande variabler för respektive lands aktieindex. Variablerna arbetslöshet, ränta och oljepris visade sig inte ha någon signifikant påverkan på varken Dow Jones eller OMXS30. Det visade sig dock att aktieindexen reagerade på samma sätt, för respektive lands variabler..

Beräkningsmodul för ett förbättrat offertförfarande och minskad icke-värdeskapande tid

In early January 2010 the authors participated in a meeting with the chief engineer for a company in which a central part is manufacturing of printed circuit boards (PCB). At this meeting it emerged that the machinery and production methods have changed substantially since the early 1990's. The spreadsheet for preliminary production time calculations by the company is today based on conditions from almost 20 years ago. The company has over the years been trying to adjust the spreadsheet template. The result of these adjustments has filled it with historical residue, something which makes the template difficult and time consuming when the primary user tries to handle it.The purpose of this study was to help the company increase its accuracy in the representation of the production times for the different PCB-based products by developing a new costing model based on an already existing but inadequate spreadsheet template. The company also expressed the wish that the new costing model would be less time consuming to work with.The methods used to achieve the goal are interviewing, participatory observations and meetings with relevant persons. The data obtained were analyzed using the theory on PCB production and visualization of data.

En utvärdering av två olika sa?tt att skatta fördelningen till stickprovsmedelvärden från olikfördelade data - normalapproximation kontra resampling

This report evaluates whether normal approximation or resampling is to prefer for estimating the distribution of the sample mean and functions of the sample mean. The evaluation relies on simulation studies. The observations of the sample are allowed to be differently distributed. In the case of sample means they are also allowed to be dependent.For sample means the two approximations behaves very similar. The most important component whether we have a good or a bad approximation is how good the approximations catch the variance of the true distribution.

En slumpmässig vandring eller genomsnittlig återgång : Råder förutsägbarhet på Stockholmsbörsen?

This study has been conducted in order to determine the existence of predictability for the Stockholm stock exchange. With this purpose the random walk theory has been raised against the theory of mean reversion in order to determine which theory is the most substantial. Data has been collected from Nasdaq OMX Nordic and furtherly been processed using the statistical software EViews. Swedish listed companies? daily share values between 2000-2014 have been analyzed using two tests; an Augmented Dickey Fuller test and a Variance Ratio test.

"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.

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.

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..

<- Föregående sida 2 Nästa sida ->