My operating system is Windows95 .What I am trying to do is to the following
:
After having generated ,say, 1000 normally distributed variables with mean
50 and standard deviation 10 ; from this I
derived three variables : mean , sd and i , where sd stands for standard
deviation and i stands for the variable number.Then I implement the command
: keep if mean > 49.9 & mean < 50.1 & sd> 9.9 & sd< 10.1
which gives me the following list :
+----------------------------+
mean sd i
----------------------------
1. 49.98775 9.995832 101
2. 49.92238 9.921903 140
3. 50.04274 9.959353 237
4. 49.91986 10.02384 267
5. 50.06425 10.03112 307
----------------------------
6. 50.09529 9.923013 353
7. 50.07205 9.926955 363
8. 49.9694 10.00273 365
9. 49.9058 9.911177 391
10. 49.95581 10.05547 400
----------------------------
11. 50.08439 10.07163 415
12. 50.03706 10.02582 428
13. 49.93437 9.979973 437
14. 49.95476 10.009 456
15. 49.99855 9.99959 545
----------------------------
16. 50.08477 9.915329 559
17. 50.09824 9.93272 564
18. 49.99771 10.01748 574
19. 50.02956 10.07592 589
20. 49.96579 10.06241 614
----------------------------
21. 49.96054 10.04056 649
22. 50.03897 9.999675 747
23. 50.03214 9.958685 751
24. 49.91431 9.926854 778
25. 50.02348 9.960877 820
----------------------------
26. 50.0564 9.956045 896
27. 50.00867 9.907173 964
28. 50.02766 9.918256 1000
+----------------------------+
Please note that I have saved each of the 1000 variables under a1.dta,
a2.dta , a3.dta, .... , a1000.dta , but at the point of saving them, I do
not know ,which variables are consistent with my imposed constraints.The
above list makes it clear however which are the right variables .Therefore I
know that : a101.dta , a140.dta, a237.dta, ........ a964.dta , a1000.dta
are variables with mean and standard deviation that fall within the
criteria of 49.9< mean<50.1 & 9.9<sd<10.1 .
What I Want is to know if there is such a thing as going back to the
individual datasets, a101.dta, a140.dta, ...... , a1000.dta
and install them again , automatically (not manually) , in the directory
under a different name such as b101.dta, b140.dta, ....., b1000.dta , such
that , later on I could write over the a1.dta, a2.dta, a3.dta, ...
,a1000.dta and still have access to the variables that are of interest to
me.
Please bear with me if I am still unclear as to what I want .
Thank you before hand,
Victor Michael Zammit
----- Original Message -----
From: Nick Cox <[email protected]>
To: <[email protected]>
Sent: Monday, September 13, 2004 11:37 AM
Subject: st: RE: Re: RE: Re:Is there any way ?
> This renaming of files is largely between you
> and your (still unstated) operating system,
> although Stata is available as an intermediary.
>
> For example, under the Windows XP command prompt,
> rename can be used to rename files. From within
> Stata
>
> !rename a76.dta b76.dta
>
> will do the same thing.
>
> Nick
> [email protected]
>
> victor michael zammit
>
> > I am using version 8.2
> > What I am trying to do is to isolate normally distributed
> > variables closest
> > to a mean of 50 and a sd of 10.
> > The following clip is from a generation of 1000 such
> > variables . 76 and 833
> > are variables that qualify to the relevant criteria .They
> > are saved in my
> > directory as a76.dta and a833.dta respectively .
> > mean sd i
> > > > ---------------------------
> > > > 1. 49.96996 9.978514 76
> > ......................
> > > > 15. 50.08827 9.936735 833
> >
> > What I need is a code that is capable of (for example) ,
> > renaming a76.dta
> > , b76.dta & a833.dta , b833.dta , and thus being able
> > to freely write
> > over the previous a1.dta , a2.dta ..... a1000.dta , to
> > handle other
> > criteria , while conserving memory .
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
