Hello, I have SAS 9.4. I am trying to measure the distance between two cities.  I have HQ_ZIP variable and Affiliate_ZIP variable.  For example,  HQ_ZIP  AFF_ZIP 12345     98765   34567     87654 67890     76362 34543     65432   I want a new variable that measures the distance between HQ_ZIP and AFF_ZIP I tried;     distance = zipcitydistance ( HQ_ZIP, AFF_ZIP) but it did not work.  Help would be very appreciated.  ... View more