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Re: st: snapsan command

From   Nick Cox <>
Subject   Re: st: snapsan command
Date   Sat, 19 May 2012 10:11:56 +0100

The command is -snapspan-, not -snapsan-. I think you didn't get an
answer to this previously because it's hard to work out what you want.
The tenor of your posting is "I don't understand" and that evokes
sympathy, but it is hard to know what explanation could make it
clearer than that in the manual.

The answer to 1) is that it depends what you mean "when I work on my
variables". Depending on that, the possibilities include nothing (the
Stata command will ignore missing values), using -if- to exclude
observations with missing values, and using -drop- to drop them.

The answer to 2) is No. -generate()- is genuinely optional.

For "STATA" read "Stata". For "cox" read "Cox".


On Sat, May 19, 2012 at 10:05 AM, sara bonfanti <> wrote:

> 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
> command
> "snapsan".
> 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
> database,
> i.e. 1997) of missing values except for the event variable. Reading
> the stata manual it seems a correct output but I don愒 know how to
> deal with these missing values later on, when I work on my variables.
> 2) if it愀 necessary to specify the option "generate(newt0var)". I
> have found it on manuals, but still I don愒 understand how it works,
> and why I should use it.

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