Summary statistics for upin2npixw dataset :

by Jean Roth , jroth@nber.org , 19 Apr 2019

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
         npi |          0
         seq |     38,136    2.731566     2.56679          1         20
        upin |          0
    othpidty |     38,136    1.571848    1.400155          1          5
    othpidst |          0
-------------+---------------------------------------------------------
   othpidiss |          0
    upintype |     36,684    1.667648    1.111704          1          4
      entity |     38,136    1.228603    .4199384          1          2
 pcredential |          0

by Jean Roth , jroth@nber.org , 19 Apr 2019