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I am trying to figure out how to calculate the mahalanobis distance
for a 2 group, 2 variable simple case for a program I am writing.
My matrix is:
[1 1 3
1 2 2
1 3 1
2 8 7
2 8 6]
Column 1 is the group # and 2 & 3 are the variables.
SPSS has the casewise mahalanobis distance (smallest is listed) as:
[0.113
0.000
0.113
1.387
1.387]
My program is calculating the smallest Mahal distance as:
[1.5
0
1.5
1.5
1.5]
Can anyone help me explain where I am going wrong in this simple case? Thanks.
Alex
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