Hi, we noticed there was a error in the "arules" package.
After reading the source code, we saw that the Dice similarity index was "miscalculated" in "dissimilarity" function : an copy-paste from Jaccard Index was not corrected (2* a_b_c, ie 2*(a+b+c) in the code instead of 2*a +b + c !!!). After our mail to R-help (21/11/2006), we thought the authors could do something but I just try the function and the error is still there. I hope the authors will read my mail. Sincerely yours, Fred. -- Dr. Frédéric Chiroleu Biométricien UMR 53 PVBMT (Peuplements Végétaux et Bio-agresseurs en Milieu Tropical) CIRAD-AMIS Pôle de Protection des Plantes (3P) Laboratoire d'Écologie Terrestre et de Lutte Intégrée (LETLI) 7, chemin de l'IRAT Ligne Paradis 97410 Saint-Pierre Île de la Réunion - France Tél. : 02 62 49 92 30 Standard : 02 62 49 92 00 Fax : 02 62 49 92 93 courriel : [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
