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Schennach, Susanne M. - 2018

Many time-series exhibit "long memory": Their autocorrelation function decays slowly with lag. This behavior has traditionally been modeled via unit roots or fractional Brownian motion and explained via aggregation of heterogenous processes, nonlinearity, learning dynamics, regime switching or...

Persistent link: https://www.econbiz.de/10011941514

Evaluating ion exchange for nitrogen recovery from source-separated urine in Nairobi, Kenya

Tarpeh, William A.; Wald, Ileana; Omollo, Michael Otieno; … - In: Development Engineering 3 (2018), pp. 188-195

discharge of the treated urine. Performance, as measured by adsorption density (4.02-4.21 mmol N/g resin) and regeneration … efficiency (>90%) of the adsorbent, was consistent over ten adsorption-regeneration cycles and with columns ten times larger than …

Persistent link: https://www.econbiz.de/10012623038

Dynamic model and control system of carbon dioxide capture process in fluidized bed using computational fluid dynamics

In: Energy Reports 6 (2020) 2, pp. 52-59

dioxide capture adsorption in a fluidized bed reactor was developed based on experimental data using commercial CFD program …

Persistent link: https://www.econbiz.de/10012652219

Biochar application in the mercury ions adsorption from aqueous solutions

Gąsior, Daria; Tic, Wilhelm Jan - In: Economic and Environmental Studies (E&ES) 16 (2016) 4, pp. 803-818

approach for providing pure water. The adsorption of mercury ions onto pyrolyzed chicken manure, sewage sludge and rye straw … was studied and compared with the adsorption of mercury ions onto commercial activated carbons of various origins and … grain size. The impact of pH, biochar adsorbents amount and phase contact time on the adsorption efficiency were …

Persistent link: https://www.econbiz.de/10011849463

Forecasting a telecommunications provider's market share

Kanellos, Nikolaos; Katsianis, Dimitrios; Varoutas, … - 2022

Telecommunications providers' market share risks stem from uncertainties due to overall market performance and competition strategies adopted by providers. In this paper, a framework that allows risk-adjusted forecasting of a provider's market share is presented. Two different stochastic...

Persistent link: https://www.econbiz.de/10013420990

A modified robust confidence interval for the population mean of distribution based on deciles

Abu-Shawiesh, Moustafa Omar Ahmed; Kibria, Bhuiyan … - In: Statistics in Transition new series (SiTns) 23 (2022) 1, pp. 109-128

The confidence interval is an important statistical estimator of population location and dispersion parameters. The paper considers a robust modified confidence interval, which is an adjustment of the Student's t confidence interval based on the decile mean and decile standard deviation for...

Persistent link: https://www.econbiz.de/10013444123

Internal meta-analysis for Monte Carlo simulations

Andor, Mark Andreas; Bernstein, David H.; Parmeter, … - 2023

Monte Carlo (MC) simulations are one of the dominant approaches to compare statistical methods. To date, there is no standard procedure for MC simulations. Although internally valid, they exhibit a certain degree of arbitrariness through the various choices that researchers make. In this paper,...

Persistent link: https://www.econbiz.de/10014293722

Recovering Income Distribution in the Presence of Interval-Censored Data

Canavire Bacarreza, Gustavo J.; Rios-Avila, Fernando; … - 2023

This paper proposes a method to analyze interval-censored data, using multiple imputation based on a heteroskedastic interval regression approach. The proposed model aims to obtain a synthetic data set that can be used for standard analysis, including standard linear regression, quantile...

Persistent link: https://www.econbiz.de/10014296665

Paradigm shift in finance: The transformation of the theory from perfect to imperfect capital markets using the example of company valuation

Ernst, Dietmar; Gleißner, Werner - In: Journal of Risk and Financial Management 15 (2022) 9, pp. 1-13

In the capital market and financing theory, we are currently observing major upheavals. For decades, the neoclassical paradigm has dominated in science and practice. Triggered by economic and political crises, transformations, the COVID-19 pandemic, and political instabilities, a paradigm shift...

Persistent link: https://www.econbiz.de/10014332599

Robust estimation and inference in panels with interactive fixed effects

Armstrong, Timothy B.; Weidner, Martin; Zeleneev, Andrei - 2023

We consider estimation and inference for a regression coefficient in panels with interactive fixed effects (i.e., with a factor structure). We show that previously developed estimators and confidence intervals (CIs) might be heavily biased and size-distorted when some of the factors are weak. We...

Persistent link: https://www.econbiz.de/10014480692