# st: Problem creating multiple loops

 From "Hugh Colaco" To statalist Subject st: Problem creating multiple loops Date Fri, 13 Jun 2008 13:29:10 -0400

```Hi,

I realize that my earlier post a couple of days ago was not very
clear. So, here is another try. I need a more efficient code than the
one below. I tried various combinations of -local-, -foreach- and
-forval-, but am unable to get it right.

gen var1_1 = ln(((var1_1994-var1_1993)/var1_1993)+1) if year==1993;

gen var1_2 = ln(((var1_1995-var1_1993)/var1_1993)+1) if year==1993;

gen var1_3 = ln(((var1_1996-var1_1993)/var1_1993)+1) if year==1993;

gen var1_4 = ln(((var1_1997-var1_1993)/var1_1993)+1) if year==1993;

replace var1_1 = ln(((var1_1995-var1_1994)/var1_1994)+1) if year==1994;

replace var1_2 = ln(((var1_1996-var1_1994)/var1_1994)+1) if year==1994;

replace var1_3 = ln(((var1_1997-var1_1994)/var1_1994)+1) if year==1994;

replace var1_4 = ln(((var1_1998-var1_1994)/var1_1994)+1) if year==1994;

............

............

............

replace var1_1 = ln(((var1_2003-var1_2002)/var1_2002)+1) if year==2002;

replace var1_2 = ln(((var1_2004-var1_2002)/var1_2002)+1) if year==2002;

replace var1_3 = ln(((var1_2005-var1_2002)/var1_2002)+1) if year==2002;

replace var1_4 = ln(((var1_2006-var1_2002)/var1_2002)+1) if year==2002;