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Table 4 The correlation matrix of all the variables in the study (correlation coefficients in the lower left half, P values in the upper right half). Most correlations are expressed as Pearson r coefficient. Only correlations for area (printed in italics) were calculated using Spearman rs rank correlation coefficient (see explanation in the ‘Methods’ section)

From: The ethnobotany and biogeography of wild vegetables in the Adriatic islands

  No. of veg Median no. of veg Areaa Population Flora Longitude Isolationb
No. of veg   2.6E−05 0.75 0.21 0.37 0.11 0.57
Median no. of veg 0.87   0.96 0.15 0.48 0.06 0.67
Areaa 0.09 − 0.01   − 0.03 0.07 0.45 0.15
Population 0.34 0.39 0.55   0.09 0.73 0.01
Flora − 0.26 − 0.21 0.49 0.47   0.14 0.55
Longitude 0.42 0.50 − 0.17 − 0.10 − 0.42   0.47
Isolationb − 0.15 − 0.12 − 0.39 − 0.63 − 0.18 0.20  
  1. aFor this variable, Spearman rs (rank correlation) coefficient was calculated
  2. bThis variable was log-transformed in order to achieve normal distribution