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st: combining two variables into one with half-yearly date format

From   Jennifer Delaney <>
Subject   st: combining two variables into one with half-yearly date format
Date   Tue, 14 Mar 2006 06:15:58 -0800

I have two time variables in my dataset - one for year and one for semester.
Both of these variables are numeric with Year containing four-digit year
values ranging from 1990 to 2005 and Semester is a 0 1 variable for fall
and spring.  The dataset is structured such that for each id every year has
two semesters.  I would like to combine the Year and Semester variables into
one time variable to allow me to work with the dataset as a panel. 
Ultimately I hope to to tsset the dataset once I have the new variable. 
How do I recode (or replace) the Year and Semester variables to create one
variable that is formated in the half-yearly date format?  As an end result
I would like to have one variable that reads 1990h1 for spring term 1990 and
1990h2 for fall term 1990, etc.

What I currently have:

ID  Year  Semester
1   1990	 F
1   1990	 S
2   1991	 F
2   1991	 S

What I would like to have:

ID  Half-Year
1      1990h1
1      1990h2
2      1991h1
2      1991h2

Thank you in advance for your help.

Jennifer Delaney

Jennifer Delaney
PhD candidate in Higher Education
Stanford University
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