Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: select three non-identical random elements
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: select three non-identical random elements
Date
Thu, 4 Apr 2013 11:09:33 +0100
-levelsof- is a command, not a macro. See e.g.
http://www.stata.com/statalist/archive/2008-08/msg01258.html
Here's an example of one way to do it.
sysuse auto
egen tag = tag(rep78)
sort tag
levelsof rep78 in -3/L
You might well want to introduce more randomness that you could control.
If this problem arose again and again for me, and no one suggested a
better solution, I'd write a Mata-based command.
Nick
[email protected]
On 4 April 2013 10:42, Tomáš Houška <[email protected]> wrote:
> Dear Statalist,
>
> I have list of items create by -levelsof- macro and I would like to select
> three items from that list at random and for them to be non-repetitive
> (i.e. each one can appear only once in the selection).
>
> Lets say I have a list -local list "one two three four five six"- and I
> would like to get
> local random1 =
> local random2 =
> local random3 =
>
> where each one is a random selection from the local list and each item
> appears at max once.
> I would appreciate any help on how to do that.
>
> Thank you!
> Tomas
> *
> * 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/
*
* 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/