Frequencies for ami7aipstr variable in hvbp_ami_10_28_2015 dataset :

       AMI-7a |
  Improvement |
       Points |      Freq.     Percent        Cum.
--------------+-----------------------------------
Not Available |      3,041      100.00      100.00
--------------+-----------------------------------
        Total |      3,041      100.00

by Jean Roth , jroth@nber.org , 15 Nov 2016