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We present results of searching for the possible typical scales in thespatial distribution of QSOs. Our method is based on the second derivative ofthe two-point correlation function. This statistic is sensitive to the scale ofthe maximum in the spectrum $P(k)$ of the density perturbation in the universe.This maximum or bend scale can be detected as the wavelengths of the periodiccomponent in the second derivative of the integral correlation function. Forvarious QSO samples compiled from surveys of pencil-beam and bright QSOs, atypical scale of about 93 $\pm$ 10 h$^{-1}$Mpc for $q_0=0.5$ has been detected.This typical scale is in good agreement with that found in the spatialdistributions of galaxies, clusters of galaxies, and CIV absorption systems ofQSOs if $q_0$ is taken to be $\sim 0.2$. Therefore, it is likely a common oruniversal scale in the large scale structure traced by these objects. Thisresult is consistent with the assumption that the typical scale comes from acharacteristic scale in the spectrum of the density perturbation in theuniverse.Comment: 16 pages, 13 figures (available upon request), Latex, AZPH-TH/94-02,  to appear in Ap.

Typical scales in the spatial distribution of QSOs