In stated preference surveys, data regarding the considered alternatives is sometimes collected prior to preferred alternative. When chosen alternative not in consideration set, inconsistent with choice data. Several modeling approaches have been used such situations. Some researchers ignore and assume all are considered. Others only use consistent delete observations. The most intricate method...

wetlands as a situ for the growth of native plants, as a habitat for certain species of fish and aquatic birds, and because of their potential economic, cultural and recreational services, are valuable heritage so their protection and conservation is very essential. mostly due to the absence of wetlands services’ valuation, lack of special regulations, and lack of guarantee for these properties...