“…Dangi et al (2008Dangi et al ( , 2011 successfully demonstrated stratified cluster sampling of municipal solid waste for households in Kathmandu, Nepal and assessed the statistical limitations involved. The approach, which utilized a form of socioeconomic stratification across geographic areas, was based on a comprehensive review of numerous studies (Marquez, Ojeda, & Hidalgo, 2008;Mosler, Drescher, Zurbrügg, Rodriguez, & Miranda, 2006;Okot-Okumu & Nyenje, 2011;Sharma & McBean, 2007;Tchobanoglous, Theisen, & Vigil, 1993;Troschinetz & Mihelcic, 2009). A similar sampling approach has been used by Qu et al (2009) by utilizing socioeconomic variables throughout different districts of Beijing City to obtain required number of households.…”