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Table 2 The N( M cp , f ) for the different f shapes tested

From: The retail market as a complex system

f N( M cp , f )
ax + b 0.616106811666
a x 2 +bx+c 0.628533747603
a log(x)+b 0.623911138356
a x b 0.572996769269
a x 0.609588181022
a x + b c x + d 0.632547410976