use "Z:\mydocs\ys209\grad.dta", clear

. bootstrap "rreg grad inc pbla phis edexp urb", reps(500) saving(gradboot)
list of statistics not found
r(198);

. bootstrap "rreg grad inc pbla phis edexp urb" _b, reps(500) bca saving(gradboot)

command:      rreg grad inc pbla phis edexp urb
statistics:   b_inc      = _b[inc]
              b_pbla     = _b[pbla]
              b_phis     = _b[phis]
              b_edexp    = _b[edexp]
              b_urb      = _b[urb]
              b_cons     = _b[_cons]

Bootstrap statistics                              Number of obs    =        50
                                                  Replications     =       500

------------------------------------------------------------------------------
Variable     |  Reps  Observed      Bias  Std. Err. [95% Conf. Interval]
-------------+----------------------------------------------------------------
       b_inc |   500  .0023026  .0001875  .0010071    .000324   .0042813   (N)
             |                                       .0004815   .0045189   (P)
             |                                       .0001103   .0041933  (BC)
             |                                       .0000866   .0041625 (BCa)
      b_pbla |   500 -.4363851  -.024598  .0885818  -.6104244  -.2623458   (N)
             |                                       -.691924  -.3371038   (P)
             |                                      -.6265706  -.2689711  (BC)
             |                                      -.5974226  -.2026129 (BCa)
      b_phis |   500 -.7694454 -.0294217  .2273881  -1.216201  -.3226894   (N)
             |                                      -1.352331  -.4644518   (P)
             |                                      -1.488516  -.4818505  (BC)
             |                                      -1.271897  -.4399405 (BCa)
     b_edexp |   500 -.0020356  .0001437  .0019951  -.0059555   .0018842   (N)
             |                                      -.0057164   .0020881   (P)
             |                                      -.0057701   .0019808  (BC)
             |                                      -.0059501   .0019569 (BCa)
       b_urb |   500 -.0876498  -.016327  .0631676   -.211757   .0364573   (N)
             |                                      -.2309934   .0110802   (P)
             |                                      -.2181483   .0355732  (BC)
             |                                      -.2123547   .0459506 (BCa)
      b_cons |   500   65.1962 -1.382468  7.942559   49.59122   80.80118   (N)
             |                                       45.65712   79.20918   (P)
             |                                        49.7173   81.08922  (BC)
             |                                       49.94154   81.89346 (BCa)
------------------------------------------------------------------------------
Note:  N   = normal
       P   = percentile
       BC  = bias-corrected
       BCa = bias-corrected and accelerated

. use gradboot, clear
(bootstrap: rreg grad inc pbla phis edexp urb)

. histogram b_pbla, normal
(bin=22, start=-.82115513, width=.03513)

. histogram b_inc, normal
(bin=22, start=-.00012416, width=.00025063)

. histogram b_phis, normal
(bin=22, start=-2.0755365, width=.07814385)

. histogram b_edexp, normal
(bin=22, start=-.00842041, width=.00058009)

. * 18 Apr 2006