We couldn't reproduce your error with the lag operator.
--begin log--
. sysuse auto,clear
(1978 Automobile Data)
. generate time = _n
. tsset for time
panel variable: foreign (unbalanced)
time variable: time, 1 to 74
delta: 1 unit
. sort for time
. replace rep=l.rep if rep==. & l.rep != .
(5 real changes made)
--end of log--
Could you send [email protected] a dataset and do-file that reproduces this
error so that we can diagnose this problem?
-Kerry Kammire
[email protected]
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