Frequencies for ami7aipstr variable in hvbp_ami_05_28_2013 dataset :

     AMI-7a |
Improvement |
     Points |      Freq.     Percent        Cum.
------------+-----------------------------------
 2 out of 9 |          1        0.03        0.03
 6 out of 9 |          1        0.03        0.07
 9 out of 9 |          1        0.03        0.10
        N/A |      2,981       99.90      100.00
------------+-----------------------------------
      Total |      2,984      100.00

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