Search results for "Statistica"
showing 10 items of 5969 documents
A Study of the Influence of Shadowing on the Statistical Properties of the Capacity of Mobile Radio Channels
2008
Article from the journal: Wireless Personal Communications The original publication is available at www.springerlink.com : http://dx.doi.org/10.1007/s11277-008-9545-7 This paper studies the influence of shadowing on the statistical properties of the channel capacity. The problem is addressed by using a Suzuki process as an appropriate statistical channel model for land mobile terrestrial channels. Using this model, exact solutions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of the channel capacity are derived. The results are studied for different levels of shadowing, corresponding to diff…
Dynamics of a Single Species in a Fluctuating Environment under Periodic Yield Harvesting
2013
We discuss the effect of a periodic yield harvesting on a single species population whose dynamics in a fluctuating environment is described by the logistic differential equation with periodic coefficients. This problem was studied by Brauer and Sánchez (2003) who attempted the proof of the existence of two positive periodic solutions; the flaw in their argument is corrected. We obtain estimates for positive attracting and repelling periodic solutions and describe behavior of other solutions. Extinction and blow-up times are evaluated for solutions with small and large initial data; dependence of the number of periodic solutions on the parameterσassociated with the intensity of harvesting i…
Statistical Analysis of the (In)efficiency of Bitcoin : A comparison of the weak form efficient market hypothesis in the US and Venezuela
2019
Master's thesis Business Administration BE501 - University of Agder 2019 Bitcoin is a phenomenon that has received a lot of attentionduringthe last years. Although the literature on the subject has expanded, there is still need for more research. This paper replicates the work of Urquhart (2016) and examines whether there isevidence ofweak form efficiency in the Bitcoin market. He found that the Bitcoin market in the US showed signs of moving towards weak form efficiency. We contribute to the existing literature by adding recentdata and comparing two different markets;the USand Venezuela. To obtain robustness of the results, the analysis is conducted by performing six different statistical …
Has the Introduction of Bitcoin Futures on Regulated Exchanges Decreased Price Volatility?
2019
Master's thesis Business Administration BE501 - University of Agder 2019 Bitcoin is a tremendously debated phenomenon in the world of finance and in recent the scientific literature on the topic has expanded. In this thesis,the bitcoin to US dollar exchange rate is examined through various conditional variance models to describe its highly volatile nature. We examine whether the introduction of bitcoin futurescontractsin late 2017 has had a decreasing impact on price volatility by estimatingthe unconditional variance. The log-return of the bitcoin exchange rate is analysed,and there is evidence of volatility clustering and time-varying volatility. Consequently, the variance is modelled thro…
The VFR Phenomenon in Italy
2015
The collection is the first book to explore research on visiting friends and relatives (VFR). In assembling an international collection of quality VFR-related research the editors present the profiles, characteristics, opportunities and behaviours of VFR travel for the benefit of researchers, industry practitioners and educators. This chapter discusses the characteristics of the phenomenon in Italy, by analysing official data as well as data drawn from purpose research.
Modalitātes lietojums tiešsaistes laikrakstu rakstos Lielbritānijā un ASV par politiskām tēmām
2020
Iepriekšējie pētījumi par modalitātes lietojumu laikrakstu rakstos atklāja, ka žurnālisti mēdz ietekmēt lasītājus un sniegt faktu subjektīvu interpretāciju, kad tiek gaidīts objektīvs notikumu atspoguļojums. Tāpēc šī darba mērķis bija analizēt modalitātes lietojumu septiņpadsmit tiešsaistes laikrakstu rakstos divos Lielbritānijas un divos ASV laikrakstos par Brexit. Pētījumā izmantotās metodes ir diskursa analīze un statistiskā analīze. Rezultāti liecina, ka visvairāk lietotais modālais darbības vārds abu valstu laikrakstos ir will, kas izteica pārliecības nozīmi ar pierādījumu palīdzību, un norādīja, ka priekšroka tiek dota patiesībai. Pārējie modālie darbības vārdi would un could dominēja…
Analisi statistica della marea meteorologica sui tre versanti siciliani
2012
La progettazione di porti, di opere di difesa e di protezione dei litorali e la pianificazione delle attività umane sulla costa richiedono una buona conoscenza delle fluttuazioni del livello del mare. Quest’ultimo è determinato dalla somma di due contributi principali: la marea astronomica, che essendo periodica è di facile predizione, e quella meteorologica, che viene considerata aleatoria. Nel presente lavoro, a partire dalle misure del livello idrico registrate dai mareografi dei porti di Catania, Palermo e Porto Empedocle nel periodo 1999-2010, sono state ricostruite le rispettive maree meteorologiche ed analizzate statisticamente al fine di trovare la migliore distribuzione di probabil…
Agritourism and local development: A methodology for assessing the role of public contributions in the creation of competitive advantage
2018
Abstract Agriculture has been an economic mainstay of countries throughout history. Recently, its importance and essential role in local and regional growth and development have also received due acknowledgment. However, agritourism entrepreneurs often lack the necessary means, when relying only on their own funds alone. For these reasons, targeted aid measures are provided at the regional, national and European levels, provided they fulfill specified subjective and objective eligibility criteria. This investigation aims at understanding the rationale, if any, according to which the Public Administration allots such contributions. To this end, a two-tiered analysis was conducted on the data…
La valutazione della qualità dei servizi sanitari: dalla descrizione alla spiegazione
1999
L'efficienza delle strutture ospedaliere siciliane
2003
This paper refers to the evaluation of the technical efficiency of Sicilian hospitals, based on official data provided by the Italian Ministry of Health. We used both descriptive (in particular: the Barber’s nomogram) and explanatory methods (DEA models) in order to highlight some remarkable features and implications of them and to compare the different results produced. Some results contradict the stereotypes on the supposed inefficiency of public hospitals as opposite to the efficiency of private ones.