Browsing by Author "Le Roux, Niel"
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- ItemFlexible graphical assessment of experimental designs in R : the vdg package(Foundation for Open Access Statistics, 2016-10) Schoonees, Pieter; Le Roux, Niel; Coetzer, RoelofThe R package vdg provides a flexible interface for producing various graphical summaries of the prediction variance associated with specific linear model specifications and experimental designs. These methods include variance dispersion graphs, fraction of design space plots and quantile plots which can assist in choosing between a catalogue of candidate experimental designs. Instead of restrictive optimization methods used in traditional software to explore design regions, vdg utilizes sampling methods to introduce more flexibility. The package takes advantage of R's modern graphical abilities via ggplot2 (Wickham 2009), adds facilities for using a variety of distance methods, allows for more flexible model specifications and incorporates quantile regressions to help with model comparison.
- ItemThe impact of industry classification on the valuation accuracy of multiples in the South African capital market(The Clute Institute, 2013-01) Nel, Soon; Bruwer, Wilna; Le Roux, NielAlthough multiples are used extensively in practice, empirical guidance in emerging markets is limited in this regard. In terms of valuation accuracy, the impact of peer group selection by way of industry classification in emerging markets has not yet been substantiated by research. This paper investigates the valuation performance of multiples over various industry classifications when valuing the equity of South African companies listed on the Johannesburg Stock Exchange for the period 2001 to 2010. The empirical results revealed that peer group selection based on a narrower industry classification could, on average, increase valuation accuracy by as much as 19.60%.