
From  Paulo Guimaraes <guimarap@musc.edu> 
To  statalist@hsphsun2.harvard.edu 
Subject  st: Gllamm for location choice with location specific variables 
Date  Mon, 20 Nov 2006 09:22:47 0500 
Date: Sat, 18 Nov 2006 21:49:20 +0000
From: Xiaoheng Zhang <zhangx@tcd.ie>
Subject: st: Gllamm for location choice with location specific variables
Dear all,
I am working on the conditional logit model to look for the determinants of
multinational's location choice of new firms. I used the traditional CLOGIT
command and decided to go further using GLLAMM.
I redid the discrete choice model example in GLLAMM's manual(RabeHesketh et
al.2004) in Chatper 9.Unfortunately in that example only one explanatory
variable was used and this variable is choicer specific variableSEX.In my case
I have some country level variables,i.e. tax rate as well as firm level
variables(nationality) but I cannot figure out how to put both knid of variables
into the model.Besides, my computer took 15 hours to maximize the likelihood but
end up with nothing so I can not even try different combinations..........
Anyone having experiences can give me a hint on how to do it?Data is already in
the "expand" form as required by CLOGIT.
Thanks a lot!
Kevin in Dublin
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Date: Sun, 19 Nov 2006 08:47:59 0500
From: Kit Baum <baum@bc.edu>
Subject: st: ivreg2 updated
The ivreg2 package of Baum, Schaffer, Stillman has been updated. We have added an improved test for weak instrumentsthe Cragg/Donald testfor which critical values are available from the work of Jim Stock and Moto Yogo. We thank them for permission to reproduce their published critical values in our code.
The ivreg2 program's output now features hyperlinks to the relevant section of the help file for a number of the statistics reported. The help file itself has been extensively redone with embedded hyperlinks and section headings to ease navigation.
ivreg2 requires Stata 8.2 or better. Users of Stata 7 may use the version accessible from the Stata Journal. You may download the updated ivreg2 using the ssc command or by adoupdate. Please do not download these routines with a web browser, especially in a Windows environment.
We thank the many users who have helped us improve this routine. We are working on more formal documentation of its enhanced abilities, and will circulate that when it is completed. The ivreg2 package includes, as an ancillary file, the certification script which we use to test its reliability. For more information on Stata software certification, please see Bill Gould's paper
http://ideas.repec.org/a/tsj/stataj/v1y2001i1p2950.html
Kit
Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.statapress.com/books/imeus.html
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Date: Sun, 19 Nov 2006 07:14:41 0800 (PST)
From: george owuor <gowuor2001@yahoo.com>
Subject: [none]
Dear all,
i am running instrumental variables estimations. y=f(X,W), and W is endogenours, so stage one becomes W=f(Z), and stage 2 becomes y=f(X, Predicted W). My function is aproduction function with conventional inputs such as fertiliser, seeds, labour and then credit which is the (W). Must the number of RHS variables in stage one be the same number as RHS ones in stage two.
Please help.
Owuor
____________________________________________________________________________________
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Date: Sun, 19 Nov 2006 15:39:12 +0000
From: Socrates Mokkas <socrates.mokkas@economics.oxford.ac.uk>
Subject: st: Join String Variables
Hi People,
OK, I know how to split string variables but have not found a way to join string variables. Did a search but could not source something out. Can you direct me to a command? Or if not is there a way round it. I just want to put two or more strings in one even if missing values exist. For example,
obs Var1 Var2 Var3 Var3
1 A B K ABK
2 C C
3 D ED BED
I have Var1 and Var2 and want to create Var3.
Thanks a lot.
Socrates Mokkas
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Date: Sun, 19 Nov 2006 16:45:01 +0100
From: "Daniel Stegmueller" <d.stegmueller@gmail.com>
Subject: Re: st: RE: rename individual columns/rows of a matrix
Nick,
thank you very much for your suggestions!
Best,
Daniel
2006/11/17, Nick Cox <n.j.cox@durham.ac.uk>:
I think whatever you do will end in something like
matrix rownames ... = ...
or
matrix colnames ... = ...
where the RHS includes the new names. This is adoable,
as I understand it. The question is whether the result
is any less awkward than doing it directly. Here is one stab,
not tested much.
 matrcrename.ado
// NJC 1.0.0 17 November 2006
// matrix row_or_column rename
program matrcrename
version 8
// syntax matrixname row_or_col which_row_or_col new_name
// matrix name
gettoken matrix 0 : 0
confirm matrix `matrix'
// row or column
gettoken which 0 : 0
local length = length("`which'")
if lower("`which'") == substr("row",1,`length') {
local which row
}
else if lower("`which'") == substr("column",1,`length') {
local which col
}
else {
di as err "second argument should specify row or column"
exit 198
}
// which row or column
gettoken where newname : 0
if "`which'" == "row" {
capture local found = inrange(`where', 1, rowsof(`matrix'))
if _rc {
di as err "inappropriate row number?"
exit 498
}
if !`found' {
di as err "row out of range"
exit 498
}
}
else {
capture local found = inrange(`where', 1, colsof(`matrix'))
if _rc {
di as err "inappropriate column number?"
exit 498
}
if !`found' {
di as err "column out of range"
exit 498
}
}
// test newname
tempname moo
matrix `moo' = J(1,1,1)
capture matrix rownames `moo' = `newname'
if _rc {
local what = cond("`which'" == "col", "column", "row")
di as err "inappropriate `what' name?"
exit 498
}
// in business!
local names : `which'names `matrix'
tokenize `names'
local `where' `newname'
local newnames "`*'"
matrix `which'names `matrix' = `newnames'
end

Examples:

. mat li z
symmetric z[3,3]
X Y Z
a 1
b 1 1
c 1 1 1
. matrcrename z row 3 Stata
. mat li z
symmetric z[3,3]
X Y Z
a 1
b 1 1
Stata 1 1 1
. matrcrename z col 4 SAS
column out of range
r(498);
. matrcrename z col 3 Some Alternative Software
inappropriate column name?
r(498);
. matrcrename frog col 3 toad
matrix frog not found
r(111);

Nick
n.j.cox@durham.ac.uk
Daniel Stegmueller
is there a quick way to change individual columns or rows of a matrix?*
The 'matrix rownames' command is not useful, since I want to use a
loop to rename rows and columns stepby step.
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  Blore's Razor:
Given a choice between two theories, take the one which is funnier.
 
Daniel Stegmüller
Elisabethstr. 3
68165 Mannheim
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Date: Sun, 19 Nov 2006 10:59:58 0500
From: Kit Baum <baum@bc.edu>
Subject: st: instrumental variables
George said
i am running instrumental variables estimations. y=f(X,W), and W is endogenours, so stage one becomes W=f(Z), and stage 2 becomes y=f (X, Predicted W). My function is aproduction function with conventional inputs such as fertiliser, seeds, labour and then credit which is the (W). Must the number of RHS variables in stage one be the same number as RHS ones in stage two.
George should heed the Statalist FAQ and use informative subject headings on his postings.
He should read any textbook discussion of instrumental variables / two stage least squares. He might also find the Baum/Schaffer/ Stillman Stata Journal article useful; a working paper version can be accessed from
http://ideas.repec.org/a/tsj/stataj/v3y2003i1p131.html
One does not run the first stage and second stage as separate regressions. The number of included endogenous variables (one in his example, W) must be less than or equal to the number of excluded instruments. His mention of Z does not make clear whether that is a variable or a matrix of variables. If Z is a single variable, the equation would be exactly identified via the order condition. It would be preferable if the equation were overidentifiedif Z contained more than one columnfor then Sargan/Hansen tests for overidentifying restrictions could shed some light on the adequacy of the instruments.
Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.statapress.com/books/imeus.html
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Date: Sun, 19 Nov 2006 17:06:01 +0100
From: "Ingo Brooks" <ingo.brooks@gmail.com>
Subject: Re: st: drop in a dofile
Joe,
I think the problem should be solved by defining km`i' to be a
 tempname, see help tempname.
Hope this helps,
Ingo
On 11/19/06, Joe Trubisz <jtrubisz@mac.com> wrote:
OK...that's useful, but can you explain the following sequence of*
commands (some output supressed):
.infile str15 disease v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11
v12 v13 v14 v15 v16 using "/Users/h/ data/
CollectedBucketsL16.txt",clear
. do clusterk 4
. cap: drop km* < added this as you suggest to the do file
. local low = `1'  2
. local high = `1' + 4
. forvalues i=`low'/`high' {
2. cluster kmeans v1v`1', k(`i') name(km`i')
3. cluster stop km`i'
4. }
This works...but if I follow it with the same command again as in:
. do clusterk 4
. cap: drop km*
. local low = `1'  2
. local high = `1' + 4
. forvalues i=`low'/`high' {
2. cluster kmeans v1v`1', k(`i') name(km`i')
3. cluster stop km`i'
4. }
km2 already defined
r(198);
. display km2
km2 not found
r(111);
If I run it again, it works. However, if I manually drop km* (first
line below) and issue the command again, I get the following:
. drop km* < I typed this in
. do clusterk 4
. cap: drop km*
. local low = `1'  2
. local high = `1' + 4
. forvalues i=`low'/`high' {
2. cluster kmeans v1v`1', k(`i') name(km`i')
3. cluster stop km`i'
4. }
km2 already defined
r(198);
If I run do clusterk 4 now, it works.
Any suggestions?
TIA,
Joe
On Nov 18, 2006, at 8:56 PM, Kit Baum wrote:
Joseph writes*
I am automating a bunch of commands in a do file, so I can rerun
the do file, just changing the argument.
If I have a:
drop km*
in my do file, the first time thru, it fails because it can't drop it.
No problem, since I can run as: do clusterk 4, nostop
and it goes fine.
However, if I rerun the next time thru as: do clusterk 6, nostop,
it fails with error number 198,
saying that variable km2 exists. You can see that the drop works
though, since it disappears
from the variables window.
help capture
Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.statapress.com/books/imeus.html
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Date: Sun, 19 Nov 2006 17:28:27 +0100
From: "Svend Juul" <SJ@SOCI.AU.DK>
Subject: Re: st: Join String Variables
Socrates wrote: OK, I know how to split string variables but have not found a way to join string variables. Did a search but could not source something out. Can you direct me to a command? Or if not is there a way round it. I just want to put two or more strings in one even if missing values exist. For example,
obs Var1 Var2 Var3 Var3
1 A B K ABK
2 C C
3 D ED BED
I have Var1 and Var2 and want to create Var3.
 
Assuming that you want to create var4 from var1, var2, and var3:
generate var4 = var1+var2+var3
You might also want to study:
help string functions
Hope this helps
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 DK8000 Aarhus C, Denmark Phone, work: +45 8942 6090 Phone, home: +45 8693 7796 Fax: +45 8613 1580 Email: sj@soci.au.dk _________________________________________________________
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Date: Sun, 19 Nov 2006 16:50:10 0000
From: "Nick Cox" <n.j.cox@durham.ac.uk>
Subject: RE: st: Join String Variables
In addition,
egen Var4 = concat(Var1 Var2 Var3)
In this example, egen, concat() gains you nothing, but it has some other features that make it more worthwhile.
Nick n.j.cox@durham.ac.uk
Svend Juul
Socrates wrote: OK, I know how to split string variables but have not found a way to join string variables. Did a search but could not source something out. Can you direct me to a command? Or if not is there a way round it. I just want to put two or more strings in one even if missing values exist. For example,*
obs Var1 Var2 Var3 Var3
1 A B K ABK
2 C C
3 D ED BED
I have Var1 and Var2 and want to create Var3.

Assuming that you want to create var4 from var1, var2, and var3:
generate var4 = var1+var2+var3
You might also want to study:
help string functions
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Date: Sun, 19 Nov 2006 17:23:57 0000
From: "Nick Cox" <n.j.cox@durham.ac.uk>
Subject: RE: st: Data Manipulation Question
This is an FAQ.
replace Parent = Parent[_n1] if missing(Parent)
would work in this example.
More generally, see How can I replace missing values with previous or following nonmissing values?
How can I replace missing values within sequences?
http://www.stata.com/support/faqs/data/missing.html
Bob Yaffee's approach based on pretending that this is a panel data set can thus be avoided. His further suggestion of
using destring wouldn't work, as Parent has no numeric interpretation, and is also unnecessary, as the logic of the device above applies to both numeric and string variables.
Nick n.j.cox@durham.ac.uk
Socrates Mokkas
I have a question related to data manipulation. My data sample is*
like that:
Parent Subsidiary
A B
C
D
F
X J
L
Z T
What I want is to fill the gaps of the ParName.
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Date: Sun, 19 Nov 2006 12:25:39 0500
From: Robert A Yaffee <bob.yaffee@nyu.edu>
Subject: Re: st: Join String Variables
Socrates,
Try egen Var3=concat(Var1 Var2 Var3)
Regards,
Robert
Robert A. Yaffee, Ph.D.
Research Professor
Shirley M. Ehrenkranz
School of Social Work
New York University
home address:
Apt 19W
2100 Linwood Ave.
Fort Lee, NJ
070243171
Phone: 2012423824
Fax: 2012423825
yaffee@nyu.edu
  Original Message 
From: Socrates Mokkas <socrates.mokkas@economics.oxford.ac.uk>
Date: Sunday, November 19, 2006 10:39 am
Subject: st: Join String Variables
Hi People,*
OK, I know how to split string variables but have not found a way to join string variables. Did a search but could not source something out. Can you direct me to a command? Or if not is there a way round it. I just want to put two or more strings in one even if missing values exist. For example,
obs Var1 Var2 Var3 Var3
1 A B K ABK
2 C C
3 D ED BED
I have Var1 and Var2 and want to create Var3.
Thanks a lot.
Socrates Mokkas
*
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Date: Sun, 19 Nov 2006 17:54:41 0000
From: "Nick Cox" <n.j.cox@durham.ac.uk>
Subject: RE: st: Join String Variables
Note that this won't work, as egen never replaces.
If you did want to overwrite Var3,
egen temp = concat(Var1 Var2 Var3) replace Var3 = temp
drop temp
Nick n.j.cox@durham.ac.uk
Robert A Yaffee
Try egen Var3=concat(Var1 Var2 Var3)Socrates Mokkas
*I just want to put two or more strings in one even if missing values exist. For example,
obs Var1 Var2 Var3 Var3
1 A B K ABK
2 C C
3 D ED BED
I have Var1 and Var2 and want to create Var3.
Thanks a lot.
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Date: Sun, 19 Nov 2006 13:52:38 0500
From: "John P. Bigelow" <J.Bigelow@EconGroup.Com>
Subject: st: Re: st Variable dropped from regression: how to capture event?
   Friedrich Huebler <huebler@rocketmail.com> wrote:
I am running a loop of regressions that should only be completed when all variables are included. In case a variable is dropped I want to skip the rest of the loop and continue with the next regression.As an alternative to some of the suggestions that have been offered already,
The regression still runs, but with an incomplete set of variables.
How can I check whether a variable was dropped?
you could test the variable list without even running the regression by
using the  _rmcoll  command. or  _rmdcoll  command.
Say you want to regress Y on X1 X2 X3, but only if the X variables are
noncollinear.
Before running the regression set up with
local depvar = "X1 X2 X3"
then run
_rmcoll `depvar'
_rmcoll will return in r(varlist) a list of noncollinear variables found in
`depvar'
If `r(varlist)' and `depvar' are the same go ahead and run
reg Y `depvar'
otherwise skip it.
John Bigelow
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Date: Sun, 19 Nov 2006 22:46:33 +0100
From: "Alessandro Fiaschi" <alefiaschi@gmail.com>
Subject: st: frequency distribution (graphic)
Dear all, I would like to do graphic descriptions of all the variables
of my panel (firm data, ten years), to show some appearance of
nonnormality. In particular, I'm interested in making an histogram
with frequency distribution for each variable (x = values of variable,
y = fraction). Thanks in advance for any help.
Alex
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Date: Sun, 19 Nov 2006 22:33:07 +0000 (GMT)
From: Maarten buis <maartenbuis@yahoo.co.uk>
Subject: Re: st: frequency distribution (graphic)
  Alessandro Fiaschi <alefiaschi@gmail.com> wrote:
I would like to do graphic descriptions of all the variablesAlex:
of my panel (firm data, ten years), to show some appearance of
nonnormality. In particular, I'm interested in making an histogram
with frequency distribution for each variable
have a look at help twoway histogram, in particular look at the by
option (I am assuming you actually don't want to compare different
variables, but the distribution of the same variable for different
firms). If you really want to put histograms of different variables in
the same graph, look at help graph combine.
HTH,
Maarten
 
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
 
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