an:01419406
Zbl 0945.62038
Grzegorzewski, Przemys??aw
Statistical inference about the median from vague data
EN
Control Cybern. 27, No. 3, 447-464 (1998).
00063619
1998
j
62G05 62G15 62G99 62G10
fuzzy numbers; fuzzy sets; sign-test; vague data; confidence interval; hypothesis testing; median
Summary: In traditional statistics all parameters of the mathematical model and possible observations should be well defined. Sometimes such assumption appears too rigid for the real-life problems, especially when dealing with imprecise or linguistic data. To relax this rigidity fuzzy methods are incorporated into statistics. This paper is devoted to statistical inference about the population median in the presence of vague data. We propose the notion of fuzzy median. Then we suggest a fuzzy estimator and fuzzy confidence interval for the median. Next we discuss the problem of hypothesis testing concerning the median in the presence of imprecise data. All methods presented are distribution-free.