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vec1
2012 Mar 15
2
summing "transfers"
I have a dataframe from an On-Board Survey with weights ("expwgt") and variables for up to 8 used lines: VEH1 through VEH8. The lines are labeled "MT-..1" through "MT-902". I want to know how many transfers there are between MT-802 and MT-901. That is, when one of them is VEHx and the other is VEHx+1 or VEHx-1
E.g. {VEH1 = MT-802 AND VEH2 = MT-901 } plus {VEH2 = MT-901 AND VEH3 = MT-8...