time variable must contain only integer values

[Maurice Roche]

Hi


I do not understand what is causing the r(451) error after the second GMM command below.

xtset person year, delta(2) format(%ty)
panel variable: person (unbalanced)
time variable: year, 1998 to 2016, but with gaps
delta: 2 years

The following code works
gmm (1- {b=1}*F.gross_r*(F.totcons/totcons)^(-1*{gamma=1})), instruments(gross_r L.gross_r ly L.ly)

The following code gives me an r(451) error
gmm (1- {b=1}*F.gross_r*(F.totcons/totcons)^(-1*{gamma=1})), xtinstruments(ly, lags(2/3)) instruments(L.gross_r) winitial(xt L)

time variable must contain only integer values
r(451);

But Year is stored as an integer.



. dataex person year totcons gross_r ly in 1/10

----------------------- copy starting from the next line -----------------------

* Example generated by -dataex-. To install: ssc install dataex
clear
input float person int year float(totcons gross_r ly)
 9 1998  5008.018 1.0561262 20900
 9 2000  4949.356 1.0418211 23000
 9 2002  5906.731  .9898661 22440
 9 2004  5534.972  .9723974 16000
 9 2006  6316.314 1.0307101 23000
 9 2008 3593.0674  .9943333     0
 9 2010 4865.0444  .9557594     0
10 1998  8846.052 1.0561262     0
10 2000  7747.692 1.0418211     0
10 2002  9452.782  .9898661     0
end
format %ty year

------------------ copy up to and including the previous line ------------------

Listed 10 out of 39783 observations





Any advice on how to fix this would be appreciated.


yours sincerely
Mo