Re: st: basic question

[Eric Booth <ebooth@ppri.tamu.edu>]

<>
Take a look at -help sum()- to see that the sum function creates a running sum of a single variable(down the column), e.g., 
****
clear
input v9535  v9102  v1022 
3 4 5
5 . 6
9 . .
. . . 
1 1 1
end
gen sal=sum(v9535)
****
//If you want the row sum/total you can:
**
gen sal2 = v9535+v9102+v1022
**
//but as you note, this creates a missing sum where there are missing values, so one option is to use the -egen- rowtotal:
**
egen sal3 = rowtotal(v9535 v9102 v1022)
**
- Eric
On Aug 22, 2011, at 8:11 PM, Nadine Brooks wrote:

> By there are missing values particularlly in v9102 and v1022, so I
> think that I can not use the operator +, can I?
> 
> 
> 
> 2011/8/22 Daniel Marcelino <dmsilv@gmail.com>:
>> try
>> 
>> gen sal= (v9535 + v9102 + v1022)
>> 
>> Daniel
>> 
>> 
>> On Mon, Aug 22, 2011 at 8:54 PM, Nadine Brooks <nb.statalist@gmail.com> wrote:
>>> Hi statalist
>>> 
>>> I am a beginner Stata user and I am having trouble to generate a new
>>> variable. I am using:
>>> gen sal=sum (v9535,v9102,v1022)
>>> and I am getting: v9535,v9102,v1022 invalid name
>>> r(198);
>>> 
>>> But the names of all the variables are correct, so what I am doing wrong?
>>> 
>>> Thanks
>>> *
>>> *   For searches and help try:
>>> *   http://www.stata.com/help.cgi?search
>>> *   http://www.stata.com/support/statalist/faq
>>> *   http://www.ats.ucla.edu/stat/stata/
>>> 
>> 
>> 
>> 
>> --
>> About me: http://danielmarcelino.zip.net/
>> 
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>> 
> 
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/