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# Re: st: Append new row to existing matrix

 From "Sandy Y. Zhu" <[email protected]> To [email protected] Subject Re: st: Append new row to existing matrix Date Sat, 24 Mar 2012 19:31:42 -0400

```I guess I just want to know what I should do with this portion of the
code if my variables are y (dependent), X1, X2, and X3 (independent)

gen y=uniform()
forv i=1(1)100 {
qui gen x`i'=uniform()
qui reg y x`i'

Thanks!

On Sat, Mar 24, 2012 at 7:28 PM, Sandy Y.  Zhu <[email protected]> wrote:
> Thank you!
>
> Would some one mind telling me what this portion of the code means?
>
>>        qui gen x`i'=uniform()
>>        qui reg y x`i'
>
> I'm trying to run a multivariate regression, so should I do multiple
> qui gen x`i'?
>
> Thanks!
>
> 2012/3/24 Jorge Eduardo Pérez Pérez <[email protected]>:
>> clear
>> set obs 100
>> gen y=uniform()
>> forv i=1(1)100 {
>>        qui gen x`i'=uniform()
>>        qui reg y x`i'
>>        matrix b=e(b)
>>        if `i'==1 matrix betas=b
>>        else matrix betas=(betas \ b)
>>        drop x`i'
>> }
>> matrix list betas
>>
>> Also, take a look at -statsby-
>> _______________________
>> Jorge Eduardo Pérez Pérez
>>
>>
>>
>> On Sat, Mar 24, 2012 at 7:11 PM, Sandy Y.  Zhu <[email protected]> wrote:
>>> Hi guys:
>>>
>>> How can I append a new row to an existing matrix? Basically, I'm
>>> trying to update the matrix in a loop,
>>>
>>> I have:
>>>
>>> for i=1 to 900
>>> {reg y x1 x2 x3
>>> mat beta=e(b)
>>>
>>> append e(b) to an existing matrix}
>>>
>>> Basically, I  have 900 regressions to run, and I  need to save the
>>> beta values from each regression. I would like to save them all in a
>>> matrix, so the first row in the matrix saves the betas from the 1st
>>> regression, the 2nd row would save the coefficients from the 2nd
>>> regression, etc....
>>>
>>>
>>> Thank you!
>>>
>>> --
>>> Yours sincerely,
>>>
>>> Sandy Y. Zhu
>>> *
>>> *   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/
>
>
>
> --
> Yours sincerely,
>
> Sandy Y. Zhu

--
Yours sincerely,

Sandy Y. Zhu

*
*   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/
```