海氷面積の時系列推移

Call:
lm(formula = `Sea Ice Index:北極域(万平方キロメートル)` ~ 
    t)

Residuals:
    Min      1Q  Median      3Q     Max 
-55.040 -16.032   1.841  20.578  46.898 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) 1207.8428     8.3962  143.86  < 2e-16 ***
t             -5.5470     0.4068  -13.64  4.1e-15 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 24.31 on 33 degrees of freedom
Multiple R-squared:  0.8493,    Adjusted R-squared:  0.8447 
F-statistic: 185.9 on 1 and 33 DF,  p-value: 4.102e-15

Call:
lm(formula = `Sea Ice Index:南極域(万平方キロメートル)` ~ 
    t)

Residuals:
    Min      1Q  Median      3Q     Max 
-155.81  -34.31    4.76   24.63  126.45 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) 1180.2770    18.8988  62.452   <2e-16 ***
t             -1.1199     0.9157  -1.223     0.23    
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 54.71 on 33 degrees of freedom
Multiple R-squared:  0.04337,   Adjusted R-squared:  0.01438 
F-statistic: 1.496 on 1 and 33 DF,  p-value: 0.2299

Call:
lm(formula = `Sea Ice Index:全球(万平方キロメートル)` ~ 
    t)

Residuals:
    Min      1Q  Median      3Q     Max 
-122.53  -40.45  -10.54   34.59  141.88 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) 2388.1198    20.1196 118.696  < 2e-16 ***
t             -6.6670     0.9748  -6.839 8.35e-08 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 58.24 on 33 degrees of freedom
Multiple R-squared:  0.5863,    Adjusted R-squared:  0.5738 
F-statistic: 46.78 on 1 and 33 DF,  p-value: 8.347e-08