Fig. 2.
Cross-correlation functions between log-transformed monthly ASRs and log-transformed monthly SVIs of the respective search terms for the four cancers. The two solid lines are critical values for cross-correlation (at the 5% level)
Cross-correlation functions between log-transformed monthly ASRs and log-transformed monthly SVIs of the respective search terms for the four cancers. The two solid lines are critical values for cross-correlation (at the 5% level)