1 Retraction Note: Qual Quant (2017) 51:1297–1304 https://doi.org/10.1007/s11135-016-0331-4

The Editor-in-Chief has retracted this article (Mladenović et al. 2017) because validity of the content of this article cannot be verified. This article showed evidence of substantial text overlap [most notably with the articles cited (Marković et al. 2016; Milovančević et al. 2016)], peer review and authorship manipulation. All of the authors disagreed with the publication of this retraction.