ResearchSpace
→
Research Publications/Outputs
→
Journal Articles
→
Browsing Journal Articles by Author

Browsing Journal Articles by Author "Das, Sonali"

Now showing items 1-20 of 21

Next Page

Are Earth Sciences lagging behind in data integration methodologies?

Author: Paasche, H ; Eberle, D ; Das, Sonali ; Cooper, Antony K ; Debba, Pravesh ; Dietrich, P ; Dudeni-Thlone, N ; Gläßer, C ; Kijko, A ; Knobloch, A ; Lausch, A ; Meyer, U ; Smit, A ; Stettler, A ; Werban, U Date: Nov 2013 This article reflects discussions German and South African Earth scientists, statisticians and risk analysts had on occasion of two bilateral workshops on Data Integration Technologies for Earth System Modelling and Resource Management. The ... Read more
Automated pattern recognition to support geological mapping and exploration target generation: a case study from southern Namibia

Author: Eberle, D ; Hutchins, D ; Das, Sonali ; Majumdar, A ; Paasche, H Date: Jun 2015 This paper demonstrates a methodology for the automatic joint interpretation of high resolution airborne geophysical and space-borne remote sensing data to support geological mapping in a largely automated, fast and objective manner. At the ... Read more
Bayesian structural equations model for multilevel data with missing responses and missing covariates

Author: Kim, S ; Das, Sonali ; Chen, M-H ; Warren, N Date: Mar 2008 Motivated by a large multilevel survey conducted by the US Veterans Health Administration (VHA), we propose a structural equations model which involves a set of latent variables to capture dependence between different responses, a set of ... Read more
Bayesian structural equations modeling for ordinal response data with missing responses and missing covariates

Author: Kim, S ; Das, Sonali ; Chen, M-H ; Warren, N Date: Jan 2009 Structural equations models (SEMs) have been extensively used to model survey data arising in the fields of sociology, psychology, health, and economics with increasing applications where self assessment questionnaires are the means to collect ... Read more
Bubbles in South African house prices and their impact on consumption

Author: Das, Sonali ; Gupta, R ; Kanda, PT Date: Apr 2011 This paper first tests for house price bubbles in the South African housing market, using quarterly data from 1969:Q2 to 2009:Q3, based on the unit root test developed by Phillips et al. (2007). This test not only allows us to detect whether ... Read more
Convergence of metropolitan house prices in South Africa: a re-examination using efficient unit root tests

Author: Das, Sonali ; Gupta, R ; Kaya, PA Date: 2010 This paper analyzes whether the Law of One Price (LOOP) holds in the housing market of five metropolitan areas of South Africa, namely Cape Town, Durban, Greater Johannesburg, Port Elizabeth/Uitenhage and Pretoria. The authors test the existence ... Read more
Could we have predicted the recent downturn in home sales of the four US census regions?

Author: Gupta, R ; Tipoy, CK ; Das, Sonali Date: 2010 This paper analyzes the ability of a random walk and, classical and Bayesian versions of autoregressive, vector autoregressive and vector error correction models in forecasting home sales for the four US census regions (Northeast, Midwest, ... Read more
Could we have predicted the recent downturn in the South African housing market?

Author: Das, Sonali ; Gupta, R ; Kabundi, A Date: 2009 This paper develops large-scale Bayesian Vector Autoregressive (BVAR) models, based on 268 quarterly series, for forecasting annualized real house price growth rates for large-, medium- and small-middle-segment housing for the South African ... Read more
The development and application of a fabric objective measurement data system in the South African apparel industry: Hygral expansion and formability

Author: Das, Sonali ; Hunter, Lawrance ; Botha, Anton F Date: Mar 2017 A programme has been initiated with the objective to develop an advanced Fabric Objective Measurement (FOM) based technology, knowledge and data system which is relevant to, and can be implemented in, the South African apparel industry to ... Read more
Do associations between employee self-reported organisational assessments and attitudinal outcomes change over time? An analysis of four Veterans Health Administration surveys using structural equation modelling

Author: Das, Sonali ; Chen, M-H ; Warren, N ; Hodgson, M Date: Dec 2010 This paper evaluates relationships between healthcare employees’ perceptions of three hospital organisational constructs (Leadership, Support and Resources), and their assessment of two employee-related outcomes (employee satisfaction, ... Read more
Fabric quality issues related to apparel merchandising

Author: Das, Sonali ; Hunter, Lawrance Date: Feb 2015 The objectives of this study are to develop an understanding of fabric quality related issues and research gaps relevant to apparel manufacturing and merchandising within the South African context. The specific focus is on fabric objective ... Read more
Fire management in Mediterranean-climate shrublands: a case study from the Cape fynbos, South Africa

Author: van Wilgen, BW ; Forsyth, GG ; de Klerk, H ; Das, Sonali ; Khuluse, S ; Schmitz, P Date: 2010 The authors used a spatial data base of fires within 10 protected areas covering >720 000 ha to examine the frequency, seasonality, size and cause of fires over four decades. Their study covered five fire climate zones and a range of mountain ... Read more
Forecasting regional house price inflation: a comparison between dynamic factor models and vector autoregressive models

Author: Das, Sonali ; Gupta, R ; Kabundi, A Date: 2010 This paper uses the dynamic factor model framework, which accommodates a large cross-section of macroeconomic time series, for forecasting regional house price inflation. In this study, the authors forecast house price inflation for five ... Read more
Investigating the complex relationship between in situ Southern Ocean pCO2 and its ocean physics and biogeochemical drivers using a nonparametric regression approach

Author: Pretorius, W ; Das, Sonali ; Monteiro, Pedro MS Date: Jan 2014 The objective in this paper is to investigate the use of a non-parametric model approach to model the relationship between oceanic carbon dioxide (pCO(sub2)) and a range of biogeochemical in situ variables in the Southern Ocean, which influence ... Read more
Pedestrian fatality and natural light: Evidence from South Africa using a Bayesian approach

Author: Das, Sonali Date: Feb 2014 In this paper we use a Bayesian approach to investigate the relationship between pedestrian fatality records from Tshwane and time of fatality. Time of fatality is used as a proxy to reflect the presence of effective lighting, not precluding ... Read more
Predicting downturns in the US housing market: a Bayesian approach

Author: Gupta, R ; Das, Sonali Date: Oct 2010 This paper estimates Bayesian Vector Autoregressive (BVAR) models, both spatial and non-spatial (univariate and multivariate), for the twenty largest states of the US economy, using quarterly data over the period 1976:Q1–1994:Q4; and then ... Read more
Real interest rate persistence in South Africa: Evidence and implications

Author: Das, Sonali ; Gupta, R ; Kanda, PT ; Reid, M ; Tipoy, CK ; Zerihun, MF Date: Dec 2012 The real interest rate is a very important variable in the transmission of monetary policy. It features in vast majority of financial and macroeconomic models. Though the theoretical importance of the real interest rate has generated a sizable ... Read more
Spatial Bayesian methods of forecasting house prices in six metropolitan areas of South Africa

Author: Gupta, R ; Das, Sonali Date: Jun 2008 This paper estimates Spatial Bayesian Vector Autoregressive models (SBVAR), based on the First-Order Spatial Contiguity and the Random Walk Averaging priors, for six metropolitan areas of South Africa, using monthly data over the period of ... Read more
Statistical studies for SNP association in acute coronary syndrome ex vivo use of agonists and nanoparticles

Author: Das Roy, P ; Basu, C ; Das, Sonali ; Das Gupta, A Date: Jun 2014 In this paper we apply statistical classification techniques to a case-control study. The data analysed relates to Acute Coronary Syndrome (ACS). We discuss an adaptation of the NaÄ³ve Bayes method, and assess the results using an analysis ... Read more
Temporal causality between house prices and output in the U.S.: a bootstrap rolling-window approach

Author: Nyakabawo, W ; Miller, SM ; Balcilar, M ; Das, Sonali ; Gupta, R Date: Jul 2015 This paper examines the causal relationships between the real house price index and real GDP per capita in the US, using the bootstrap Granger (temporal) non-causality test and a fixed-size rolling-window estimation approach. We use quarterly ... Read more

Now showing items 1-20 of 21

Next Page

Browse

All of ResearchSpace
This Collection
- By Issue Date
- Authors
- Titles
- Subjects
- Publication Type
- Cluster
- Impact Area

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.