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Mean DJFM NAO index values are grouped by Bonacina categories. The differences between groups of the NAO index are compared visually using boxplots (Figure 2) and statistically using an analysis of variance (ANOVA) and Tukey honest significant differences (HSD) (Yandell 1997) tests, the latter to account for family-wise analysis (Table 2).
Table 2

Tukey HSD difference in medians of NAO indices between pairs of Bonacina classes

PairDifferenceP-value
Very snowy–snowy −0.823 0.093 
Snowy–average −0.670 0.008 
Average–little −0.697 0.002 
PairDifferenceP-value
Very snowy–snowy −0.823 0.093 
Snowy–average −0.670 0.008 
Average–little −0.697 0.002 
Figure 2

Boxplots (median, upper and lower quartiles and range) showing winter NAO index grouped by Bonacina snowiness categories.

Figure 2

Boxplots (median, upper and lower quartiles and range) showing winter NAO index grouped by Bonacina snowiness categories.

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