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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
Re: st: Re: creating average over past three years within groups |

Date |
Fri, 3 Oct 2008 15:10:45 +0200 |

Well, no, if you -sum, meanonly- your medians then it delivers the mean of medians. The problem with your proposal is that the -local- assignment does not allow an -if- statement. That is why I say: calculate your results beforehand with -sum- and the -if- statement, store them in -local-s and then do your -replace-...

HTH

Martin

_______________________

----- Original Message ----- From: "Fabian Brenner" <Fabian.Brenner@gmx.de>

To: <statalist@hsphsun2.harvard.edu>

Sent: Friday, October 03, 2008 3:04 PM

Subject: Re: st: Re: creating average over past three years within groups

Dear Martin:

your proposal will result in the 3-year-mean of means; but I want to get the 3-year-mean of (yearly) medians (across observations). This is why I cannot use meanonly; I would need "medianonly" for your solution, which unfortunately doesn't exist.

Please correct me if I'm wrong.

This is why I want to do it like this, but I don't kow what is wrong (Stata says: if not allowed r(101))

quietly forvalues k = 1/10 {

quietly forvalues y = 1974/2000 {

local median3 = oneyearmedian if year == `= `y' - 3' & industry == `k',

local median2 = oneyearmedian if year == `= `y' - 2' & industry == `k',

local median1 = oneyearmedian if year == `= `y' - 1' & industry == `k',

replace fiveyearmedian = (`median3' + `median2' + `median1' ) / 3 if year == `y' & group == `k'

}

}

Hope someone could tell me..Thanks.

-------- Original-Nachricht --------

Datum: Fri, 3 Oct 2008 14:52:12 +0200 Von: "Martin Weiss" <martin.weiss1@gmx.de> An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Re: creating average over past three years within groupsTrue, consecutive -summarize-s will overwrite the rclass results so you--

have

to store the r(mean) them in -local-s. Apart from that, I do not know what

is wrong with my proposal...

HTH

Martin

_______________________

----- Original Message ----- From: "Fabian Brenner" <Fabian.Brenner@gmx.de>

To: <statalist@hsphsun2.harvard.edu>

Sent: Friday, October 03, 2008 2:40 PM

Subject: Re: st: Re: creating average over past three years within groups

> Dear Martin,

>

> I don't know if I got what you mean, but as far as I know your proposal

> using -summarize, meanonly- would lead to the average (across the most

> recent three years) of the mean (across observations within each year).

>

> But I want to get the average (across the most recent three years) of

the

> median (across observations within each year), i.e.

> average1997=(median1997+median1996+median1995)/3

>

> Hope someone could help me.

> Fabian

>

>

> [I guess your proposal would look like the following:

> quietly forvalues k = 1/10 {

> quietly forvalues y = 1974/2000 {

> summarize age if year == `= `y' - 3' & group == `k', meanonly

> local median3 = r(mean)

> summarize roe if year == `= `y' - 2' & group == `k', meanonly

> local median2 = r(mean)

> summarize roe if year == `= `y' - 1' & industry == `k', meanonly

> replace fiveyearmedian = (`median3' + `median2' + r(mean1 ) / 3 if year

==

> `y' & group == `k'

> }

> }

>

>

>

> -------- Original-Nachricht --------

>> Datum: Fri, 3 Oct 2008 14:22:16 +0200

>> Von: "Martin Weiss" <martin.weiss1@gmx.de>

>> An: statalist@hsphsun2.harvard.edu

>> Betreff: st: Re: creating average over past three years within groups

>

>> Not sure what you are doing with all those -locals-. Just -summarize,

>> meanonly- with your -if- statements and type -ret li- afterwards. >> There

>> you

>> will find the average as r(mean) to plug into your -replace- >> operation.

>>

>> HTH

>

>> Martin

>> _______________________

>> ----- Original Message ----- >> From: "Fabian Brenner" <Fabian.Brenner@gmx.de>

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

>> Sent: Friday, October 03, 2008 2:17 PM

>> Subject: st: creating average over past three years within groups

>>

>>

>> > Dear all:

>> >

>> > I used -bysort year group : egen oneyearmedian = median(age)- to

create

>> > the median within each group (1-10) for each year (1974-2000).

>> >

>> > Now I want to get the three year average of the three median for >> > each

>> > group for the most recent three years:

>> >

>> > generate threeyearaverage = .

>> > sort year group

>> >

>> > quietly forvalues k = 1/10 {

>> > quietly forvalues y = 1974/2000 {

>> > local median3 = oneyearmedian if year == `= `y' - 3' & industry ==

`k',

>> > local median2 = oneyearmedian if year == `= `y' - 2' & industry ==

`k',

>> > local median1 = oneyearmedian if year == `= `y' - 1' & industry ==

`k',

>> > replace fiveyearmedian = (`median3' + `median2' + `median1' ) / 3 if

>> year

>> > == `y' & group == `k'

>> > }

>> > }

>> >

>> > But stata always says: if not allowed r(101);

>> >

>> > What do I wrong? Hope someone can help me.

>> > Fabian Brenner

>> >

>> >

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Interessen!

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>> > * http://www.ats.ucla.edu/stat/stata/

>> >

>>

>>

>> *

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>> * http://www.stata.com/help.cgi?search

>> * http://www.stata.com/support/statalist/faq

>> * http://www.ats.ucla.edu/stat/stata/

>

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> * http://www.ats.ucla.edu/stat/stata/

>

*

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**References**:**st: creating average over past three years within groups***From:*"Fabian Brenner" <Fabian.Brenner@gmx.de>

**st: Re: creating average over past three years within groups***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**Re: st: Re: creating average over past three years within groups***From:*"Fabian Brenner" <Fabian.Brenner@gmx.de>

**Re: st: Re: creating average over past three years within groups***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**Re: st: Re: creating average over past three years within groups***From:*"Fabian Brenner" <Fabian.Brenner@gmx.de>

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