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From |
"Narahari H.S." <naraharihs@yahoo.co.in> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Getting all independent vars from a set of reg equations |

Date |
Mon, 27 Jun 2011 20:09:14 +0530 (IST) |

Hi Nick, As usual, you hit the nail on the head ! Will rectify my code. I realise that "drop" was the wrong word to use when I meant "omit". Maarten's second mail gives the solution for this as well. Thank you Hari --- On Mon, 27/6/11, Nick Cox <njcoxstata@gmail.com> wrote: > From: Nick Cox <njcoxstata@gmail.com> > Subject: Re: st: Getting all independent vars from a set of reg equations > To: statalist@hsphsun2.harvard.edu > Date: Monday, 27 June, 2011, 3:16 PM > You did not show any of your code, > but are presumably doing something like this > > indeplist > local x = r(X) > > when the latter line should be > > indeplist > local x `r(X)' > > See also > > SJ-8-4 pr0045 . . . . . . . . Stata tip 70: > Beware the evaluating equal sign > . . . . . . . . . . . . . . . . > . . . . . . . . . . . . . . N. J. Cox > Q4/08 SJ > 8(4):586--587 > > (no commands) > tip explaining the pitfall of > losing content in a macro > because of limits on the length > of string expressions > > I don't understand your second question. -drop y*- is > perfectly legal. > When you say drop do you mean omit? > > Nick > > On Mon, Jun 27, 2011 at 10:08 AM, Narahari H.S. <naraharihs@yahoo.co.in> > wrote: > > > Thanks for the example code and the explanation. It > works like a charm :). > > > > However, I have a large number of independent > variables and their total no. of characters exceeds 244 - > thus resulting in a truncation. How do I tackle this? > > > > Also, among the independent variables, I have dummy > variables for years which are named with a "y" prefix (like > y2000, y2005 etc.). Is there any way to drop these > variables? (I was hoping for a -drop y*- command similar to > -list uniq- but thats not available) > > > > Warm Regards > > Hari > > > > > > > > --- On Sun, 26/6/11, Maarten Buis <maartenlbuis@gmail.com> > wrote: > > > > From: Maarten Buis <maartenlbuis@gmail.com> > > Subject: Re: st: Getting all independent vars from a > set of reg equations > > To: statalist@hsphsun2.harvard.edu > > Date: Sunday, 26 June, 2011, 9:20 PM > > > > On Sat, Jun 25, 2011 at 3:45 PM, Narahari H.S. wrote: > >> I have to present a correlation matrix of all > independent variables from a set of regression equations. I > thought that if I could list (in one place) all the > independent variables from all the equations, I could use > them with the pwcorr command. > > > > You can get the independent variables of one > regression model using > > -indeplist- (which is available form SSC). If you have > multiple > > models, you need to know some tricks on how to deal > with local macros > > in Stata. Below is an example with three models. First > I stack all the > > names in one local macro `x', and than I drop the > duplicate names > > using -local x: list uniq x-. > > > > *---------------- begin example > ----------------------- > > sysuse auto > > > > reg price mpg foreign > > indeplist > > local x = r(X) > > > > reg price mpg rep78 foreign > > indeplist > > local x "`x' `r(X)'" > > > > reg price mpg rep78 foreign gear_ratio > > indeplist > > local x "`x' `r(X)'" > > > > di "`x'" > > > > local x : list uniq x > > di "`x'" > > > > cor `x' > > *------------------ end example > ---------------------- > > (For more on examples I sent to the Statalist see: > > http://www.maartenbuis.nl/example_faq ) > > > > * > * 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/

**References**:**Re: st: Getting all independent vars from a set of reg equations***From:*Nick Cox <njcoxstata@gmail.com>

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