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RE: st: ranking variables on the basis of total values of observations
From
tashi lama <[email protected]>
To
<[email protected]>
Subject
RE: st: ranking variables on the basis of total values of observations
Date
Wed, 28 Mar 2012 20:44:41 +0000
Hello Nick,
My apology, I mean rowranks, not rowsum. So, let's see if I could simplify it...
Essentially I want to be able to rank var2 in the following dataset looking at its total values of obs from 05jan2010 to 09jan2010. so, I would use generate sum to get a rumsum. That would look like
date var2 var3 var4 totalv~2 totalv~3 totalv~4
1. 05jan2010 3 1 7 3 1 7
2. 06jan2010 2 3 6 5 4 13
3. 07jan2010 4 4 5 9 8 18
4. 08jan2010 1 2 4 10 10 22
5. 09jan2010 5 8 3 15 18 25
6. 10jan2010 8 9 2 23 27 27
7. 11jan2010 4 6 3 27 33 30
8. 12jan2010 3 3 8 30 36 38
9. 13jan2010 1 2 3 31 38 41
So, I would look at the observations at 09jan2010. So, as you can see, var2 has 5, var3 has 8 and so on. since 5 is the second lowest in that row after 3, I would say var2 is 2nd. Now, I have to able to code this and that is exactly I think you guys can help me or give me a lead.
Thank you and let me know if I could make more clea.
Tashi
> Date: Wed, 28 Mar 2012 21:17:19 +0100
> Subject: Re: st: ranking variables on the basis of total values of observations
> From: [email protected]
> To: [email protected]
>
> I don't know what -rowsum- is here.
>
> Thanks, but this doesn't get me much closer. Of course, if other
> people can work out what you want, they should chip in.
>
> Please _show_ what you want it changed to, as I asked earlier. No
> word description, just what the dataset would like look after changes.
>
> Nick
>
> On Wed, Mar 28, 2012 at 8:49 PM, tashi lama <[email protected]> wrote:
>
> > date var2 var3 var4
> > 1. 05jan2010 3 1 7
> > 2. 06jan2010 2 3 6
> > 3. 07jan2010 4 4 5
> > 4. 08jan2010 1 2 4
> > 5. 09jan2010 5 8 3
> > 6. 10jan2010 8 9 2
> > 7. 11jan2010 4 6 3
> > 8. 12jan2010 3 3 8
> > 9. 13jan2010 1 2 3
> >
>
> > Say, I would like to rank var2 for certain period of time say (05jan2010-09jan2010). So, I would have Stata add the obs values from 05jan2010 to 09jan2010 for all the variables and rank var2 like 1st or 2nd or 3rd. I looked at rowsum. I don't think it will help.
>
> >> Date: Wed, 28 Mar 2012 20:34:58 +0100
> >> Subject: Re: st: ranking variables on the basis of total values of observations
> >> From: [email protected]
> >> To: [email protected]
> >>
> >> As far as I can see this could mean several things. I am not clear
> >> that when you say "rank" you don't mean "order" instead.
> >>
> >> I don't think you want -rowranks- (SSC).
> >>
> >> Why not just give us a toy dataset, with say 5 observations and 5
> >> variables, and what you want to change it to? Then it should be easier
> >> to see what you want.
> >>
> >> By the way, adding lots of blank lines just makes your posts more
> >> difficult to read. I've edited what came in.
> >>
> >> Nick
> >>
> >> On Wed, Mar 28, 2012 at 8:22 PM, tashi lama <[email protected]> wrote:
> >> >
> >> > I have a list of variables and I would like to rank the variables or any given variable for that matter on the basis of total values of their observations. I thought of approaching this problem in the following way.
> >> >
> >> > 1. find the running sum of all the variables using generate or the total using egen although I think I would prefer generate.
> >> >
> >> > say there are var1 var2 var3
> >> >
> >> > gen tvar1=sum(var1)
> >> > gen tvar2=sum(var2)
> >> > gen tvar3=sum(var3)
> >> >
> >> > 2. then compare tvar1, tvar2 and tvar3 using if conditions.
> >> >
> >> > Once this is done, I would like to expand such that I can rank those variables but for given period of time. And this is essentially why I think generate sum is better for this problem because it is a running sum.
> >>
> >> > say date var1 var2 var3
> >> >
> >> > I would like to be able to rank variables say for 01jan2011 to 01feb2011 and so on.
> >> >
> >> > Has anyone worked in this kind of problem before or does anyone have any idea or thought regarding this problem? Any help or lead would be highly appreciated? I saw that there is a stata module rowranks to calculate ranks in a row but i don't know how can it be useful to me. Most probably not....
>
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