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Browsing by Author "Das, Sonali"

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Ad hoc statistical consulting within a large research organization

Author: Elphinstone, CD ; Koen, Renée ; Das, Sonali Date: Aug 2009 The paper discusses the ad hoc statistical consulting service initiated within the CSIR that has proved successful; however, resourcing remains a major challenge. Even limited advertising of the service within the CSIR resulted in many requests ... Read more
Application of a nonparametric approach to analyze delta-pCO2 data from the Southern Ocean

Author: Pretorius, WB ; Das, Sonali ; Mostert, PJ Date: Nov 2011 In this paper the authors discuss the application of a classical nonparametric inference approach to analyse delta-pCO2 measurements from the Southern Ocean, which is a novel method to analysing data in this area, as well as comparing results ... Read more
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
Atmospheric corrosion effects of air pollution on materials and cultural property in Asia and Africa

Author: Foax, LJ ; Tidblad, J ; Kucera, V ; Hicks, K ; Kuylenstierna, J ; Dawei, Z ; Kai Wing, NG ; Saha, D ; Das, Sonali ; Zandi, M ; Galang, R ; Ramiz, AM ; Pradhan, BB ; Arachchi, WR ; Chantra, W ; Hong Lien, LT ; Dombo, G ; Chissico, ML ; Lungu, C ; Mmari, AG Date: Oct 2008 This project is part of the Swedish International Development Co-operation Agency (Sida) funded Program on Regional Air Pollution in Developing Countries (RAPIDC). The Program is managed on Sida's behalf by the Stockholm Environment Institute ... 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
Blessing of dimensionality if forecasting house price growth rate in the 9 census divisions of the US: 7th Triennial Conference 2009

Author: Das, Sonali ; Gupta, R ; Kabundi, A Date: 2009 Is the wealth of information contained in 126 monthly series more useful in forecasting regional real house price growth rate for the 9 census divisions of the US?. Read more
Blessing of dimensionality in forecasting real house price growth in the nine census divisions of the US: 57th International Statistical Institute Conference 2009

Author: Das, Sonali ; Gupta, R ; Kabundi, A Date: Aug 2009 This presentation deals with forecasting real house price growth in the nine census divisions of the US. Data rich environment of the FAVAR models that include a wide range of macroeconomic series of the US economy, besides the house price ... Read more
A brief review of remote sensing data and techniques for wetlands identification

Author: Ritchie, M ; Das, Sonali Date: Sep 2015 This paper reviews some data issues and associated techniques which have been implemented in the field of remote sensing for the identification of wetlands. Wetlands are found in diverse geographic areas, however in situ measurements from ... 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
Conceptual risk assessment framework for global change risk analysis SRP

Author: Elphinstone, CD ; Das, Sonali ; Khuluse, S Date: Dec 2007 This report is submitted as a deliverable of the SRP project Global Change Risk Analysis which aims at applying risk analysis as a unifying notion for quantifying and communicating threats to ecosystem services originating from global change ... Read more
Contribution statistics can make to "strengthening forensic science"

Author: Cooper, Antony K ; Das, Sonali Date: Aug 2009 In February 2009, the National Academy of Sciences (NAS) released the pre-print version of its report, "Strengthening Forensic Science in the United States: A Path Forward". While the report focused on forensic science in the United States, ... 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

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