Table 2. Pearson’s linear correlation coefficients along with the rejection probability in parenthesis
| SLD | SNmax | ASN | Lasc | Lcyc |
| AOR1 | –0.76 (0.1) | 0.69 (0.3) | 0.73 (0.1) | –0.30 (15) | –0.14 (32) |
| AOR2 | –0.63 (0.7) | 0.40 (7.7) | 0.48 (4.0) | –0.56 (1.9) | –0.18 (27) |
| AOR3 | –0.64 (0.6) | 0.85 (0.0) | 0.84 (0.0) | –0.36 (10) | –0.16 (29) |
SLD, spotless days; SNmax, maximum for a specific solar cycle; ASN, average of sunspot numbers; Lasc, length of ascending phase; Lcyc, length of solar cycle; AOR1, occurrence rate of sunspot averaged over the period from the maximum of (i − 1)th solar cycle to maximum of i-th solar cycle; AOR2, occurrence rate of sunspot is averaged over the solar-minimum period defined as the solar minimum ± 1.5 yr; AOR3, occurrence rate of sunspot is averaged over the period of the ascending phase of a given solar cycle.