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From |
"Sandy Y. Zhu" <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Append new row to existing matrix |

Date |
Sat, 24 Mar 2012 19:40:35 -0400 |

Hi everyone: Sorry to email again, but I just adjusted to my own dataset, and it won't work. My dataset has 917 events, each with 6 observations. I would like to regress rprf on rmrf, smb, and hml for each event, that's why i added reg rprf rmrf smb hml if event==`i'. I'm not sure if this is correct, but it's coming back as no observation. I know that some of the events in my dataset have no observation--is there any chance I can program it in the loop to tell stata to output an empty space for those and carry on? Thanks! Current adpated code: forv i=1(1)917 { qui reg rprf rmrf smb hml if event==`i' matrix b=e(b) if `i'==1 matrix betas=b else matrix betas=(betas \ b) } matrix list betas On Sat, Mar 24, 2012 at 7:31 PM, Sandy Y. Zhu <[email protected]> wrote: > 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 -- 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/

**References**:**Re: st: Append new row to existing matrix***From:*Jorge Eduardo Pérez Pérez <[email protected]>

**Re: st: Append new row to existing matrix***From:*"Sandy Y. Zhu" <[email protected]>

**Re: st: Append new row to existing matrix***From:*"Sandy Y. Zhu" <[email protected]>

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