“…The methods were developed in the late 70's (Takahasi & Sakasegawa, 1977) and have received increased attention in the past five years. Related developments are the hidden sensitivity method (Tang, Tian, Tang, & Liu, 2009;Tian et al, 2007), the triangular method (Tan, Tian, & Tang, 2009;Tian, Tang, Liu, Tan, & Tang, 2011;Yu, Tian, & Tang, 2008), the crosswise method (Jann, Jerke, & Krumpal, 2012;Yu et al, 2008), the method of single sample count (Petróczi et al, 2011), and the unmatched count technique (Coutts & Jann, 2011). The techniques are usually claimed to be free from the limitations of the randomized approach and to increase the relative efficiency and the degree of privacy protection.…”