Created
July 20, 2016 12:59
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custom weighted jaccard index for comparison of weighted sets in content+preference matching
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| userPreferences <- c(rep("mobile",6),rep("email",4)) | |
| contentTags <- c("email","mobile") | |
| similarityIndex <- function(content_tags=NULL,user_preferences=NULL){ | |
| #weighted intersect of content_tags and user_preference, returns a sum of weights of tags which are in both sets | |
| wi <- sum(sapply(intersect(content_tags,user_preferences),function(i) sum(i==user_preferences))) | |
| #weighted union of all items entering the computation (content_tags have a weight==1) | |
| wu <- length(user_preferences)+length(setdiff(content_tags,user_preferences)) | |
| return(wi/wu) | |
| } | |
| similarityIndex(contentTags,userPreferences) | |
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