Frequencies for ami7aipstr variable in hvbp_ami_10_28_2014 dataset :

       AMI-7a |
  Improvement |
       Points |      Freq.     Percent        Cum.
--------------+-----------------------------------
   0 out of 9 |          1        0.03        0.03
Not Available |      3,088       99.97      100.00
--------------+-----------------------------------
        Total |      3,089      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016