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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: assigning a specific row as a local variable |

Date |
Tue, 2 Oct 2012 01:22:36 +0100 |

-valuesof- is from SSC. Please remember that you are asked to explain where user-written programs you refer to come from. When defining a -local- macro [as David rightly says, not variable] the definition cannot be followed by an -if- command or qualifier. See also SJ-6-3 dm0025 . . . . . . . . . . . . . . Stata tip 36: Which observations? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q3/06 SJ 6(3):430--432 (no commands) tip for identifying which observations satisfy some specified condition SJ-6-4 dm0025 . . . . . . . . . . Stata tip 36: Which observations? Erratum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q4/06 SJ 6(4):596 (no commands) correction of example code for Stata tip 36 for some related technique. Nick On Tue, Oct 2, 2012 at 12:08 AM, Pradipto Banerjee <pradipto.banerjee@adainvestments.com> wrote: > Thanks, David. I wanted to assign the value to local macro `x' instead of a variable `x'. Actually, I have found a program -valuesof- which is pretty much what I was looking for. > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of David Radwin > Sent: Monday, October 01, 2012 7:01 PM > To: statalist@hsphsun2.harvard.edu > Subject: st: RE: assigning a specific row as a local variable > > There's no such thing as a "local variable" in Stata. I think you want a > -tempvar- (temporary variable with a local macro name). First you declare > the -tempvar-, then you use it. > > Based on your description, I would create two -tempvars-. In this example, > n = 2. > > . tempvar x > > . tempvar cond_y_sum > > . gen `cond_y_sum' = sum(cond_y) // creates cumulative sum of values where > cond_y equals 1 > > . gen `x' = y if `cond_y_sum' == 2 // assigns value of y to `x' for the > nth observation where y equals 1 > > David > -- > David Radwin > Senior Research Associate > MPR Associates, Inc. > 2150 Shattuck Ave., Suite 800 > Berkeley, CA 94704 > Phone: 510-849-4942 > Fax: 510-849-0794 > > www.mprinc.com > > >> -----Original Message----- >> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- >> statalist@hsphsun2.harvard.edu] On Behalf Of Pradipto Banerjee >> Sent: Monday, October 01, 2012 3:35 PM >> To: statalist@hsphsun2.harvard.edu >> Subject: st: assigning a specific row as a local variable >> >> Hi, >> >> I want to define a local variable x as the nth value of a column y that >> satisfies a particular condition. >> >> More specifically, suppose I have y and cond_y as follows: >> >> y cond_y >> >> 1 1 >> 3 0 >> 1 0 >> 2 1 >> 4 1 >> >> I want to assign >> >> local x = y if "y is say the 2nd value where cond_y is true" >> >> How can I achieve this? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: RE: assigning a specific row as a local variable***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: assigning a specific row as a local variable***From:*Pradipto Banerjee <pradipto.banerjee@adainvestments.com>

**st: RE: assigning a specific row as a local variable***From:*"David Radwin" <dradwin@mprinc.com>

**st: RE: RE: assigning a specific row as a local variable***From:*Pradipto Banerjee <pradipto.banerjee@adainvestments.com>

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