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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Previs?o sazonal da precipita??o para o Nordeste do Brasil: um contraste entre as metodologias de Box-Jenkins e Box-Tiao / Sazonal forecast for precipitation for Northeast Brazil: a contrast between Box-Jenkins and Box-Tiao methodologies

Souza, Thiago Rodrigues de 21 February 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-06-02T22:45:04Z No. of bitstreams: 1 ThiagoRodriguesDeSouza_DISSERT.pdf: 4007098 bytes, checksum: b98a621f29e991b3bc26a68f0060557f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-06-09T20:35:17Z (GMT) No. of bitstreams: 1 ThiagoRodriguesDeSouza_DISSERT.pdf: 4007098 bytes, checksum: b98a621f29e991b3bc26a68f0060557f (MD5) / Made available in DSpace on 2017-06-09T20:35:17Z (GMT). No. of bitstreams: 1 ThiagoRodriguesDeSouza_DISSERT.pdf: 4007098 bytes, checksum: b98a621f29e991b3bc26a68f0060557f (MD5) Previous issue date: 2017-02-21 / O objetivo deste trabalho ? realizar um estudo comparativo com ajustes de modelos de previs?es pelo m?todo de Box-Jenkins (ARIMA) e Box-Tiao (ARIMAX) para precipita??o acumulada mensal em seis cidades do Nordeste do Brasil, sendo escolhida de acordo com a classifica??o clim?tica de K?ppen. Tendo como vari?veis ex?genas: temperaturas da superf?cie do mar do oceano Atl?ntico e Pac?fico. Em todas as s?ries de precipita??o acumulada verificou-se a presen?a do componente sazonal, al?m disso, devido ao pressuposto de vari?ncia constante e normalidade dos dados n?o serem atendida, foi aplicado na s?rie original ? transforma??o Box Cox. Atrav?s das medidas de qualidade dos ajustes dos modelos pelo m?todo ARIMA e ARIMAX, temos que o modelo ARIMAX evidenciou como o melhor ajuste aos dados em estudo, apresentando menores valores para os crit?rios de informa??o AIC, erro m?dio e erro quadr?tico m?dio. / The objective this work is realize a comparative study with adjustment of previsions models by Box-Jenkins (ARIMA) and Box-Tiao (ARIMAX) methods for monthly accumulated precipitation in six cities of Brazilian northeast, choosing the cities according with K?ppen climatic classification. We've exogenes variables: sea surface temperature of Atlantic and Pacific Ocean.In all precipitations accumulated series were observerd the presence of sazonal component, besides that, due to assumption of the constante variance and data normality isn't reached, was applied in original serie the Box Cox transformation.By the measures of quality of the models adjustments by ARIMA and ARIMAX method, we've the ARIMAX model evidencied like the better adjustment to data, showing lower values to AIC information criteria, mean error and mean square error.
12

Modelling Non-Maturing Deposits: Examining the Impact of Repo Rates and Volume Dynamics on Valuation Using Regression, Time Series Analysis, and Vasicek Methods / Modellering av icke tidsbunden inlåning: Undersökning av effekterna av reporäntor och volymdynamik på värderingen med hjälp av regression, tidsserieanalys och Vasicek-metoden

Benckert, Alexandra, Loft, My January 2023 (has links)
This thesis focuses on modelling non-maturing deposits (NMD) and has been written in collaboration with Svenska Handelsbanken. The methodology includes regression analysis and time series analysis, with the Repo rate serving as an exogenous variable in both models. A Vasicek model is employed to generate future Repo rates, which are then used as inputs for forecasting the NMD volume. These simulated rates are then compared to forecasted Repo rates with discrete changes from an external source. The results are utilised to analyze how net interest income can vary in the case of constant volume and in the case of interest rate-dependent volume. Effective liquidity management is crucial for banks, and NMDs are an important source of funding. By using regression analysis and time series analysis, combined with the Repo rate as the exogenous variable, this thesis provides insights into the behaviour of NMD volumes, and how it is affected by the Repo rate. The models also enable the forecasting of future trends based on future Repo rates. Additionally, by using different data sets as input for future Repo rates, the behaviour of the model can be evaluated based on how well it coincides with reality. The results obtained from this analysis can also be used to compare the value and interest rate sensitivity of NMD products. In conclusion, this thesis provides an approach to modelling the NMD volumes using exogenous factors and demonstrates how this can affect the net interest income from deposit volumes. / Denna avhandling fokuserar på modellering av icke tidsbunden inlåning (non-maturing deposits, NMD) och har skrivits i samarbete med Svenska Handelsbanken. Metoden omfattar regressionsanalys och tidsserieanalys, där reporäntan fungerar som en exogen variabel i båda modellerna. En Vasicek-modell används för att generera framtida reporäntor, som sedan används som indata för att prognostisera NMD-volymen. Dessa simulerade räntor jämförs sedan med prognostiserade reporäntor med diskreta förändringar från en extern källa. Resultaten används sedan för att analysera hur räntenettot kan variera mellan fallet med konstant volym och fallet med ränteberoende volym. En effektiv likviditetshantering är avgörande för banker, och NMD:er är en viktig finansieringskälla. Genom att använda regressionsanalys och tidsserieanalys, i kombination med reporäntan som exogen variabel , ger denna avhandling värdefulla insikter i NMD-volymernas beteende och hur de påverkas av reporäntan. Modellerna gör det också möjligt att prognostisera framtida trender utifrån framtida reporäntor. Genom att använda olika datamängder som indata för de framtida reporäntorna kan modellens beteende dessutom värderas utifrån hur väl det sammanfaller med verkligheten. Resultaten från denna analys kan också användas för att jämföra NMD-produkternas värde- och räntekänslighet. Sammanfattningsvis ger denna avhandling ett tillvägagångssätt för att modellera NMD-volymerna med hjälp av exogena faktorer och visar på hur det kan påverka inlåningens räntenetto.

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