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In the paper, we investigate correlation between broad-line and radiovariations for broad-line radio galaxy 3C 120. By the z-transformed discretecorrelation function method and the model-independent flux randomization/randomsubset selection (FR/RSS) Monte Carlo method, we find that the broad Hbeta linevariations lead the 15 GHz variations. The FR/RSS method shows that the Hbetaline variations lead the radio variations by a factor of tau_{ob}=0.34 +/- 0.01yr. This time lag can be used to locate the position of emitting region ofradio outbursts in jet, on the order of ~ 5 light-years, from the centralengine. This distance is much larger than the size of broad-line region. Thelarge separation of the radio outburst emitting region from the broad-lineregion will observably influence the gamma-ray emission in 3C 120.

Hints of correlation between broad-line and radio variations for 3C 120