Search results for "ARIMA"
showing 10 items of 40 documents
COVID-19 Infection Process in Italy and Spain: Are the Data Talking?
2020
Background: COVID-19 has spread successfully worldwide in a matter of weeks. After the example of China, all the affected countries are taking hard-confinement measures to control the infection and to gain some time to diminish the big amount of cases that arrive to hospital. Although the measures in China reduced the percentages of new cases, this is not seen in other countries that have taken similar measures, such as Italy and Spain. Now we are in the middle of a battle trying to prevent the healthcare system from collapsing while it effectively responds to the needs of patients who are infected and require hospitalization. Methods: Using China as a mirror of what could happen in our cou…
Dažādu valūtas tirdzniecības stratēģiju salīdzinājums
2018
Valūtas tirgus ir viens no lielākajiem pasaules finanšu tirgus sektoriem un tam piemīt specifiskas īpašības (piemēram, iespēja tirgoties ar vairāk līdzekļiem nekā ieguldīts), kuras, savukārt, izmanto investori savas peļņas optimizēšanas nolūkā. Maģistra darba mērķis ir izveidot dažādas valūtas tirdzniecības stratēģijas, pielietojot ARIMA, ARMA-GARCH, slēptos Markova modeļus, u.c. metodes, un veikt tirdzniecības simulāciju dažādiem valūtu pāriem, kā arī noskaidrot, vai ar kādu no darbā aprakstītajām metodēm ir iespējams izveidot tādu valūtas tirdzniecības algoritmu, kas ilgtermiņā sniegtu peļņu. Darba gaitā izveidoti četri modeļi, kas veic tirdzniecības simulāciju, balstoties uz valūtas cenu…
Preferencias de los y las estudiantes universitarias sobre el empleo desde una perspectiva de género
2015
Se presenta un estudio de encuesta sobre las preferencias que tiene el alumnado universitario al decidirse por un trabajo, lo que creen que les debe aportar y cómo debe ser la empresa en la que desearían trabajar en función de la variable género. Diferentes investigaciones, señalan que las personas desarrollan valores, expectativas y habilidades profesionales diferentes asociadas a la carrera y a la profesión en función del género. El objetivo de este trabajo es analizar los factores que llevan a los y las jóvenes a percibir el trabajo o profesión y determinar si dicha percepción es diferente por ser hombre o mujer. A través de un cuestionario ad hoc compuesto por 52 ítems de escala Likert…
Translation, adaptation and psychometric validation of the preterm birth experience and satisfaction scale (P-BESS) into Spanish.
2018
Abstract Background Preterm labour and birth are two of the most important issues in perinatal care. The birth of a preterm baby is often a stressful and traumatic time for parents. Assessment of satisfaction with maternity services is crucial and questionnaires are the most common method as long as they are well-constructed. Only one, The Preterm Birth Experience and Satisfaction Scale (P-BESS), developed in United Kingdom, has been designed for this specific birth type. Objectives To translate, transculturally adapt and assess the psychometric properties of the P-BESS into Spanish. Design Cross-sectional study. Setting Maternity unit of a tertiary level hospital in Spain. Participants A t…
A questionnaire assessing women's care needs related to gynaecological cancer screening: development of the GCSCNS.
2013
Abstract Objective To identify women's care needs concerning cancer screening and to develop an instrument suitable for measuring them – the Gynaecological Cancer Screening Care Needs Scale (GCSCNS). We hypothesized that it is possible: (a) to explore care needs and to develop reliable subscales of them, (b) to rank these needs in order of importance, and (c) to detect determinants of these needs (age, social status, marital status, health locus of control) and these need scores. Study design A questionnaire was developed based on the relevant literature, interviews conducted with gynaecological patients, and a consultation with 18 experts. The questionnaire listed 58 items addressed to phy…
Remodelling of biological parameters during human ageing: evidence for complex regulation in longevity and in type 2 diabetes.
2013
Factor structure analyses have revealed the presence of specific biological system markers in healthy humans and diseases. However, this type of approach in very old persons and in type 2 diabetes (T2DM) is lacking. A total sample of 2,137 Italians consisted of two groups: 1,604 healthy and 533 with T2DM. Age (years) was categorized as adults (≤65), old (66-85), oldest old (>85-98) and centenarians (≥99). Specific biomarkers of routine haematological and biochemical testing were tested across each age group. Exploratory factorial analysis (EFA) by principal component method with Varimax rotation was used to identify factors including related variables. Structural equation modelling (SEM) wa…
Forecasting Electricity Consumption and Production in Smart Homes through Statistical Methods
2022
Abstract Over the last years, a steady increase in both domestic electricity consumption and in the adoption of personal clean energy production systems has been observed worldwide. By analyzing energy consumption and production on photovoltaic panels mounted in a house, this work focuses on finding patterns in electrical energy consumption and devising a predictive model. Our goal is to find an accurate method to predict electrical energy consumption and production. Being able to anticipate how consumers will use energy in the near future, homeowners, companies and governments may optimize their behavior and the import and export of electricity. We evaluated the ARIMA and TBATS statistical…
Tourism recovery amid COVID-19: The case of Lombardy, Italy
2021
Travel restrictions and social distancing imposed to curb the spread of the new coronavirus have been strongly hitting tourism since March 2020. Tourism forecasting literature addressed the effects of shocks in contexts characterized by a predictable route to recovery. COVID-19 is without precedents. In this article, monthly overnight stays for the period January 2010 to December 2020 are used to estimate the impact of the pandemic in Lombardy, Italy’s most affected region. A model-based approach is implemented, and the number of overnight stays up to December 2023 is forecasted. Four models are compared. Estimation results from an augmented SARIMA model suggest that, provided a new lockdo…
Sexual Compulsivity Scale: Adaptation and Validation in the Spanish Population
2013
Sexual compulsivity has been studied in relation to high-risk behavior for sexually transmitted infections. The aim of this study was the adaptation and validation of the Sexual Compulsivity Scale to a sample of Spanish young people. This scale was applied to 1,196 (891 female, 305 male) Spanish college students. The results of principal components factor analysis using a varimax rotation indicated a two-factor solution. The reliability of the Sexual Compulsivity Scale was found to be high. Moreover, the scale showed good temporal stability. External correlates were examined through Pearson correlations between the Sexual Compulsivity Scale and other constructs related with HIV prevention. …
Next-Day Bitcoin Price Forecast
2019
This study analyzes forecasts of Bitcoin price using the autoregressive integrated moving average (ARIMA) and neural network autoregression (NNAR) models. Employing the static forecast approach, we forecast next-day Bitcoin price both with and without re-estimation of the forecast model for each step. For cross-validation of forecast results, we consider two different training and test samples. In the first training-sample, NNAR performs better than ARIMA, while ARIMA outperforms NNAR in the second training-sample. Additionally, ARIMA with model re-estimation at each step outperforms NNAR in the two test-sample forecast periods. The Diebold Mariano test confirms the superiority of forecast …