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...te mask = 0777 [InfoTech] comment = System public = no valid users = aj tom vitus EWNS.NET+administrator writable = yes path = /infotech guest ok = no create mask = 0770 [Acct] comment = Accounting public = no valid users = tom vitus terry mikep robertm bibic selenam idam phoebe accounting acctemp write list = terry mikep robertm bibic selenam idam phoebe tom vitus accounting acctemp writable = yes path = /acct guest ok = no create mask = 0770 directory mask = 0770 force group = acct [Payroll] comment = Payroll public = no valid users...

I haven't read the book, but could anyone explain more about this parameter? help(agnes) says that ac measures the amount of clustering structure found. From the definition given in help(agnes.object), however, it seems that as long as the dissimilarity of the merger in the final step of the algorithm is large enough, the ac value will be close to 1. So what does ac really mean? Thank