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Statistical dependencies among features of coronal mass ejections (CMEs),solar flares, and sigmoidal structures in soft-X-ray images were investigated.We applied analysis methods to all the features in the same way in order toinvestigate the reproducibility of the correlations among them, which may befound from the combination of previous statistical studies. The samples of 211M-class and X-class flares, which were observed between 2006 and 2015 byHinode/X-ray telescope, Solar and Heliospheric Observatory/Large Angle andSpectrometric Coronagraph, and GOES, were examined statistically. Five kinds ofanalysis were performed: Occurrence rate analysis, linear-correlation analysis,association analysis, the Kolmogorov--Smirnov test, and Anderson-Darling test.The analyses show three main results. First, the sigmoidal structure and longduration events (LDEs) has stronger dependency on the CME occurrence than largeX-ray class events in on-disk events. Second, for the limb events, thesignificant dependency exists between LDEs and CME occurrence, and betweenX-ray class and CME occurrence. Third, there existed 32.4% of on-disk flareevents, which had sigmoidal structure and were not accompanied by CMEs.However, the occurrence probability of CMEs without sigmoidal structures isvery small, 8.8 %, in on-disk events. While the first and second results areconsistent with previous studies, we newly provided the difference between theon-disk events and limb events. The third result that non-sigmoidal regionsproduce less eruptive events is also different from previous results. Wesuggest that sigmoidal structures in soft X-ray images will be a helpfulfeature for CME prediction regarding on-disk flare events.

Statistical Relation between Solar Flares and Coronal Mass Ejections with Respect to Sigmoidal Structures in Active Regions