_dta:
  1.  by Jean Roth , jroth@nber.org , 21 Nov 2015

soleprop:
  1.  X, Not Answered
  2.  Y, Yes
  3.  N, No

  obs:     3,545,778                          
 vars:             2                          21 Nov 2015 10:13
 size:    39,003,558                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
soleprop        str1    %9s                 * Is Sole Proprietor
                                            * indicated variables have notes
-------------------------------------------------------------------------------
Sorted by:  npi