Frequencies for first 10,000 rows of vintage variable in countypopmonthasrh dataset :

    Vintage |
      Year. |
  Refers to |
  the Final |
Year of the |
Time Series |      Freq.     Percent        Cum.
------------+-----------------------------------
       2016 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 12 May 2018