Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
tashi lama <ltashi32@hotmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: could someone pls explain me this |

Date |
Mon, 30 Apr 2012 18:24:34 +0000 |

thank you. I still have some clouds. 1.Why do we have to summarize the temp var? 2.Minimum such obs no r(min). Are we looking the minimum obs in the tempvar? Is it 3 in the following example? epcom noncom __000001 | |------------------------------------------| 1. | 18001 Acheres . | 2. | 18002 Ainay-Le_Vieil . | 3. | 18003 Les Aix -d'Angillion 3 | 4. | 18004 Allogny . | 5. | 18005 Allouis . | 3. Could we have said instead of minimum or maximum no, non-missing obs no because there is only one obs in tempvar? ---------------------------------------- > Date: Mon, 30 Apr 2012 18:37:56 +0100 > Subject: Re: st: could someone pls explain me this > From: njcoxstata@gmail.com > To: statalist@hsphsun2.harvard.edu > > The code > > tempvar tv1 > gene `tv1'=_n if depcom==18003 > summ `tv1', meanonly > local index=r(min) > local mymacro=nomcom[`index'] > drop `tv1' > > is a way of looking up the value of -nomcom- when -depcom- is 18003. > The temporary variable contains observation numbers for which -depcom- > is 18003. A certain way of finding such an observation if any exist is > to find the minimum such observation number. The maximum would do fine > as an alternative. The code could be shortened > > tempvar tv1 > gene `tv1'=_n if depcom==18003 > summ `tv1', meanonly > local mymacro=nomcom[r(min)] > drop `tv1' > > The main point of similar code is to automate value look-up. It's > usually a long-winded way to proceed if you are working interactively. > > Nick > > On Mon, Apr 30, 2012 at 6:24 PM, tashi lama <ltashi32@hotmail.com> wrote: > > > I am doing sth similar to what I found in archive titiled "Re: st: save the value of a string variable into a macro". I am not sure if I followed the code although it looks relatively st. forward. > > > > > > > > Here is the dataset and goal > > > > +-----------------------------+ > > | depcom nomcom | > > |-----------------------------| > > 1. | 18001 Acheres | > > 2. | 18002 Ainay-le-Vieil | > > 3. | 18003 Les Aix-d'Angillon | > > 4. | 18004 Allogny | > > 5. | 18005 Allouis | > > +-----------------------------+ > > > > Where depcom is an id. I want to save a specific values of the variable "nomcom" into a variable, for example, I want to obtain : > > . di "`mymacro'" > > Archeres > > > > > > > > The code is > > > > > > > > tempvar tv1 > > gene `tv1'=_n if depcom==18003 > > summ `tv1', meanonly > > local index=r(min) > > local mymacro=nomcom[`index'] > > drop `tv1' > > > > > > > > > > I follow line 1 and 2. I am not sure why we need line 3. Line 4 established a macro which is used in line 5. But, I don't follow why the macro takes r(min) as expression. I would think the macro `index' should capture the value(the only value in fact) in tv1. > > * > * 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/

**Follow-Ups**:**Re: st: could someone pls explain me this***From:*Nick Cox <njcoxstata@gmail.com>

**RE: st: could someone pls explain me this***From:*tashi lama <ltashi32@hotmail.com>

**References**:**st: could someone pls explain me this***From:*tashi lama <ltashi32@hotmail.com>

**Re: st: could someone pls explain me this***From:*Nick Cox <njcoxstata@gmail.com>

- Prev by Date:
**st: RE: Canonical correlation** - Next by Date:
**RE: st: could someone pls explain me this** - Previous by thread:
**Re: st: could someone pls explain me this** - Next by thread:
**RE: st: could someone pls explain me this** - Index(es):