Abstract
Tukey's procedure of multiple comparison, namely T-method, is called WSD or HSD at present. We tried to investigate public informations on the internet, papers and literature, and to make clear the situation of the confusion concerning WSD and HSD.
As a result of the investigation, there were a lot of authors who called T-method as Tukey's procedure before 1960. But it might be referred from 1960 to 1980 as WSD, and it would be referred as HSD after 1980.
It was said that all of WSD, HSD, Tukey's procedure are the same method before 1960 at least. After that, HSD is referred as Tukey's a-method and WSD have begun to be referred as Tukey's b-method.
Some authors said that Tukey proposed Tukey's b-method, but we can not enough clarified who tried to use WSD and HSD separately first. Such confusion might be merely caused from that posterior scientists and engineers individually quote various literature.
T-method was called WSD at first, as mentioned above, so they shouldn't be classified. We hope that this paper will be able to avoid the unnecessary perplexity, and if possible, it's desirable to unify the name by WSD.
