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The properties of optical continua and emission lines of 105 quasars, radio galaxies, and Seyfert galaxies are investigated by means of published multichannel spectrophotometry data. A strong continuity was indicated between broad-line AGNs and quasars in terms of similarities in the correlations between line luminosities and nonthermal luminosity; a correlation between H-beta and nonthermal luminosity suggests that the Balmer lines result from recombination after photoionization, and that the overall spectral index and the covering factor are similar.
H. K. C. Yee (Sat,) studied this question.