Jaccard similarity calculation in recommenderlab package of R -

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what role of parameter 'alpha' in recommenderlab r package's use of jaccard method in recommender model boolean user-preferences matrix? ie 

method="jaccard",param=list(...,alpha=0.5)

i saw code ibcf , used dissimilarity function. function not defined in official cran pdf recommenderlab package. please help?

it function defined in recommenderlab. try:

library("recommenderlab") ? dissimilarity

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