Possible Vs. Scored Points - Statistical Analysis of LEED 2009-NCv3 Projects in Egypt

Abstract

— The number of Leadership in Energy and Environmental Design (LEED) projects in Egypt has increased since 2010. This paper aims to reveal the ambiguity about attributes, trends, and levels of achievements in these projects by conducting a statistical analysis of the LEED-awarded projects. The descriptive statistics clarified that most awarded/registered projects have applied for building design and construction certification (LEED 2009-NCv3). The author merged both dot-plot and boxplot techniques to visualize and measure the achieved points in the seven categories of the mentioned version. For inferential statistics, the effect size was measured between possible and scored points in both categories and credits using the nonparametric Cliff's δ effect size test. The statistical analysis shows that: Regional Priority category had a small Cliff's δ effect size (0.3), with almost half of its credits achieved high scores. Water efficiency and Innovation in design categories had a large Cliff's δ effect size (0.7), but 1/2 and 2/3 of their credits (respectively) achieved high scores. Sustainable Sites, Energy and Atmosphere, Materials & Resources, and Indoor Environmental Quality had the maximum Cliff's δ effect size (1), with half (or more) of their credits achieved low-high scores.