-----------------------------------------------------------------------------------------
      name:  <unnamed>
       log:  /disk/homedirs/nber/feenberg/egen.log
  log type:  text
 opened on:  16 Oct 2016, 18:45:03

. set obs 10000000
number of observations (_N) was 0, now 10,000,000

. set rmsg on
r; t=0.00 18:45:04

. gen id = 5*int(_n/5-.1)
r; t=0.48 18:45:04

. sort id
r; t=0.21 18:45:04

. gen x = runiform()
r; t=0.69 18:45:05

. replace x = . if runiform()>.95
(499,972 real changes made, 499,972 to missing)
r; t=0.60 18:45:06

. 
. by id: replace x = max(x[_n-1],x)
(5429110 real changes made)
r; t=0.74 18:45:06

. by id: gen groupmax = x[_N]
r; t=0.56 18:45:07

. 
. by id: egen egenmax = max(x)
r; t=24.61 18:45:31

. assert egenmax == groupmax
r; t=0.39 18:45:32

. 
end of do-file

r; t=0.00 18:45:32
. exit,clear