Table 2: Linear regression analysis of sample data (B is expressed in G, $1 \sigma $ errors of a and b are shown in brackets).
Observatories Year m Equation r
(x-y)     $(y = a + b \times x)$  
MWO-WSO 1979 191 $y = + 0.09 ~(0.03) + 0.28 ~(0.03) \times x$ 0.67
- " - 1981 179 $y = + 0.06 ~(0.04) + 0.54 ~(0.04) \times x$ 0.77
- " - 1982 175 $y = + 0.03 ~(0.04) + 1.20 ~(0.07) \times x$ 0.80
- " - 1975-1982 1442 $y = + 0.02 ~(0.01) + 0.35 ~(0.02) \times x$ 0.58
CrAO-MWO 1970-1976 665 $y = + 0.03 ~(0.03) + 0.27 ~(0.04) \times x$ 0.26
CrAO-WSO 1991 25 $y = + 0.30 ~(0.07) + 0.70 ~(0.06) \times x$ 0.94
- " - 1999 103 $y = + 0.02 ~(0.03) + 0.36 ~(0.04) \times x$ 0.70
- " - 2001 57 $y = + 0.05 ~(0.03) + 0.25 ~(0.06) \times x$ 0.52
- " - 1975-2001 712 $y = + 0.08 ~(0.01) + 0.33 ~(0.02) \times x$ 0.65
SSO-MWO 1982 32 $y = - 0.03 ~(0.05) + 0.47 ~(0.04) \times x$ 0.81
SSO-WSO 1983 84 $y = - 0.06 ~(0.04) + 0.46 ~(0.05) \times x$ 0.81
- " - 1993 28 $y = - 0.10 ~(0.04) + 0.72 ~(0.15) \times x$ 0.75
- " - 1982-1993 256 $y = - 0.05 ~(0.02) + 0.51 ~(0.03) \times x$ 0.77


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