st:transition from unemployment

[Мещеряков Антон <anton.mesh777@yandex.ru>]

Dear STATA users,

I would like to define status transitions from unemployment to employment, unemployment to olf, unemployment to unempl during two years.

In 2002 the respondents are unemployed, but in 2003 they may change they status becoming empl or olf, however, they may also stay at unemployment.
 
Data looks like (status change for one respondent during two years):

status                  year
unemp                 2002
unemp                 2002
emp                     2003 
emp                     2003
unemp                 2002
emp                     2003
olf                        2003
unemp                 2002
unemp                 2002
unemp                 2003
olf                        2003
unemp                 2002
emp                     2003
olf                        2003 

I need to identify and fix the quantity of the FIRST status change: transition from unemployment(2002) to status(emp, olf or unemp) in 2003.
Could you please help if you have ideas how to do it right?

Thanks in advance.
  
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/