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st: snapsan command

From   sara bonfanti <>
Subject   st: snapsan command
Date   Sat, 19 May 2012 11:05:29 +0200

Dear Stata users,

I'm stuck with my work beacuse of these problems.

I'm using STATA 12.1. In order to run a cox regression (stcox) I have
reshaped my dataset form wide to long and, then, I have run the

I wonder:

1) why, after running the command "snapsan", I get for each individual
a first row (corresponding to the first year of my longitudinal
i.e. 1997) of missing values except for the event variable. Reading
the stata manual it seems a correct output but I don´t know how to
deal with these missing values later on, when I work on my variables.

2) if it´s necessary to specify the option "generate(newt0var)". I
have found it on manuals, but still I don´t understand how it works,
and why I should use it.



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