The Jurkewich method is a statistical period analysis method, proposed in 1971, and also operating on unequally-spaced data. 

Peranso implements an algorithm that is slightly different from the one proposed by Jurkewich, following modifications by Dupuy and Morris [1985], and Gaspani1 [1991]. 

The Jurkewich dialog box is similar to the Lomb-Scargle dialog box. Prominent periods of the Period Window appear as peaks.