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Moderate-resolution (150-300 km s$^{-1}$) spectra covering the H$\beta$ + [O III] $\lambda$5007 spectral region were obtained for 41 radio-loud quasars (z $\leq$ 0.9) in order to investigate relationships between their broad and narrow line profiles, radio structures, and X-ray properties. The spectra of radio-loud PG quasars observed by Boroson \& Green (1992) and high-resolution spectra of Jackson \& Browne (1991) have been added to form a sample of 60 radio-loud objects with similar numbers of core- and lobe-dominated quasars.
Principal component analyses have been performed. Three main effects are present: \begin{enumerate} \item{A number of H$\beta$ profile parameters are correlated with the core dominance, a measure of orientation in the relativistic beaming model. A very broad (9000 km/s), redshifted component is strong in lobe-dominant sources (edge-on) and weak in core-dominant sources (face-on).} \item{The second most significant source of variation in the H$\beta$ profile involves the variation of an intermediate width (2000 km/s) component with a small redshift. The strength of this component is correlated with the strength of [O III] $\lambda$5007.} \item{The third effect depends on optical luminosity. As luminosity increases, $\alpha_{ox}$ increases, [O III] $\lambda$5007 line width increases, and EW(H$\beta$) and EW([O III]) decrease (a Baldwin effect).} \end{enumerate}
Contrary to some published results, two significant $non$-correlations are noted: between FWHM$_{H\beta}$ and FWHM$_{5007}$, and between the asymmetry of [O III] $\lambda$5007 and the core dominance.
