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Table 3 Descriptive statistics for indices of the spatial diversity of the cowpea varieties grown in Nigeria

From: IITA’s genebank, cowpea diversity on farms, and farmers’ welfare in Nigeria

Index Mean SD Minimum Maximum
Total
 Menhinick index 2.656 1.838 0.442 31.623
 Shannon index 0.344 0.041 0 0.693
 Berger-Parker index 2.833 1.414 1 25
 Herfindahl index 0.169 0.123 0.002 1
North West region
 Menhinick index 2.896 2.051 0.515 31.623
 Shannon index 0.343 0.045 0 0.693
 Berger-Parker index 2.856 1.349 1 10
 Herfindahl index 0.169 0.128 0.01 1
North East region
 Menhinick index 2.204 1.230 0.442 9.129
 Shannon index 0.345 0.034 0 0.368
 Berger-Parker index 2.788 1.530 1 25
 Herfindahl index 0.170 0.112 0.002 1
  1. Means, standard deviations (SD), minimums and maximums are reported for each diversity index, and broken down by regions