LL LW TL TW
LL 1. 0
LW 0.80 1. 0
TL 0.60 0.48 1. 0
TW 0.30 0.24 0.1 8 1. 0
Tetrad difference:
0.60 x 0.24 -0.48x0.30
0.144-0.144 = 0
no group factors
LL LW TL TW
LL 1. 0
Tetrad difference:
LW 0.80 1.0 0.40 x 0.40 - 0.20x0.20
0.16-0.04 = 0.1 2
TL 0.40 0.20 1.0 group factors for lengths
and widths
TW 0.20 0.40 0.50 1. 0
6 • 8 Tetrad differences of zero (above) and a positive value (below) from
hypothetical correlation matrices for four measurements: LL = leg length,
LW = leg width, TL = tail length, and TW = tail width. The positive
tetrad difference indicates the existence of group factors for lengths and
widths.