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. Fr?d?ric Chiroleu
Biom?tricien
UMR 53 PVBMT (Peuplements V?g?taux et Bio-agresseurs en Milieu Tropical)
CIRAD-AMIS
P?le de Protection des Plantes (3P)
Laboratoire d'?cologie Terrestre et de Lutte Int?gr?e (LETLI)
7, chemin de l'IRAT
Ligne Paradis
97410 Saint-Pierre
?le de la R?union - France
T?l. : 02 62 49 92 30
Standard : 02 62 49 92 00
Fax : 02 62 49 92 93
courriel : frederic.chiroleu at cirad.fr
