[R] counting duplicate items that occur in multiple groups

Jim Lemon drj|m|emon @end|ng |rom gm@||@com
Wed Nov 18 11:22:08 CET 2020

Oops, I sent this to Tom earlier today and forgot to copy to the list:

# get multiple vendors for each account
# fill in the new column
for(i in 1:length(dupAcctID))
 Data$dupAcct[Data$AcctID == names(dupAcctID[i])]<-dupAcctID[i]


On Wed, Nov 18, 2020 at 8:20 AM Tom Woolman <twoolman using ontargettek.com>

> Hi everyone.  I have a dataframe that is a collection of Vendor IDs
> plus a bank account number for each vendor. I'm trying to find a way
> to count the number of duplicate bank accounts that occur in more than
> one unique Vendor_ID, and then assign the count value for each row in
> the dataframe in a new variable.
> I can do a count of bank accounts that occur within the same vendor
> using dplyr and group_by and count, but I can't figure out a way to
> count duplicates among multiple Vendor_IDs.
> Dataframe example code:
> #Create a sample data frame:
> set.seed(1)
> Data <- data.frame(Vendor_ID = sample(1:10000), Bank_Account_ID =
> sample(1:10000))
> Thanks in advance for any help.
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