Dear Statalist members,

I am running panel data regression covering 32 years. My dependent variable is life satisfaction and I am analyzing the relationship between happiness and marital status.

I want to show what is the difference between singles, married and the ones that marry later in life. For this I want to drop the first three years after somebody is married from he observations since they might bring bias (usually the happiest years in someones life). How can I do that ?

Kind regards,
Gabriela

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input byte(lifesatis marstatus) long pid int(syear age)
 8 1 101 1987 57
 8 1 101 1988 58
 8 1 101 1989 59
 . . 101 1990  .
 . . 101 1991  .
 . . 101 1992  .
 . . 101 1993  .
 . . 101 1994  .
 . . 101 1995  .
 . . 101 1996  .
 . . 101 1997  .
 . . 101 1998  .
 . . 101 1999  .
 . . 101 2000  .
 . . 101 2001  .
 . . 101 2002  .
 . . 101 2003  .
 . . 101 2004  .
 . . 101 2005  .
 . . 101 2006  .
 . . 101 2007  .
 . . 101 2008  .
 . . 101 2009  .
 . . 101 2010  .
 . . 101 2011  .
 . . 101 2012  .
 . . 101 2013  .
 . . 101 2014  .
 . . 101 2015  .
 8 1 102 1984 44
 8 1 102 1985 45
 9 1 102 1986 46
 8 1 102 1987 47
 9 1 102 1988 48
10 1 102 1989 49
 . . 102 1990  .
 . . 102 1991  .
 . . 102 1992  .
 . . 102 1993  .
 . . 102 1994  .
 . . 102 1995  .
 . . 102 1996  .
 . . 102 1997  .
 . . 102 1998  .
 . . 102 1999  .
 . . 102 2000  .
 . . 102 2001  .
 . . 102 2002  .
 . . 102 2003  .
 . . 102 2004  .
 . . 102 2005  .
 . . 102 2006  .
 . . 102 2007  .
 . . 102 2008  .
 . . 102 2009  .
 . . 102 2010  .
 . . 102 2011  .
 . . 102 2012  .
 . . 102 2013  .
 . . 102 2014  .
 . . 102 2015  .
 8 2 103 1984 21
 8 2 103 1985 22
 7 2 103 1986 23
 7 2 103 1987 24
 . . 103 1988  .
 . . 103 1989  .
 . . 103 1990  .
 . . 103 1991  .
 . . 103 1992  .
 . . 103 1993  .
 . . 103 1994  .
 . . 103 1995  .
 . . 103 1996  .
 . . 103 1997  .
 . . 103 1998  .
 . . 103 1999  .
 . . 103 2000  .
 . . 103 2001  .
 . . 103 2002  .
 . . 103 2003  .
 . . 103 2004  .
 . . 103 2005  .
 . . 103 2006  .
 . . 103 2007  .
 . . 103 2008  .
 . . 103 2009  .
 . . 103 2010  .
 . . 103 2011  .
 . . 103 2012  .
 . . 103 2013  .
 . . 103 2014  .
 . . 103 2015  .
10 . 201 1984 58
10 . 201 1985 59
 9 . 201 1986 60
10 . 201 1987 61
10 . 201 1988 62
 9 . 201 1989 63
 8 . 201 1990 64
end
label values lifesatis p11101
label def p11101 10 "[10] Completely satisfied    10", modify
label values marstatus d11104
label def d11104 1 "[1] Married        1", modify
label def d11104 2 "[2] Single         2", modify