[gov2001-l] Replication question

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[gov2001-l] Section 5 code

Kelly_Bay＠brown.edu

12 Mar 2008 12 Mar '08

11:39 a.m.

We are new to R and are trying to use the pdata.frame command within the PLM package (panel model estimation for mixed effect models). We receive this message: "Error: could not find function "pdata.frame"" even though we have installed the plm and Ecdat packages and libraries. If you could provide us with any suggestions on how to proceed, we would greatly appreciate it. Best, Kelly, Mila and Maria Angelica _____________________________________ Kelly Bay Brown University Department of Political Science Kelly_Bay at brown.edu

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abfriedman＠gmail.com

12 Mar 12 Mar

12:13 p.m.

You've installed the packages, but have you loaded them? You need to in each session of R, with library(plm).... Ari On Wed, Mar 12, 2008 at 11:39 AM, Bay, Kelly <Kelly_Bay at brown.edu> wrote:

...

Mila_Dragojevic＠brown.edu

1:09 p.m.

Thanks for your reply. Yes, we have loaded them with library(plm)... ________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of A Friedman Sent: Wed 3/12/2008 12:13 To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question You've installed the packages, but have you loaded them? You need to in each session of R, with library(plm).... Ari On Wed, Mar 12, 2008 at 11:39 AM, Bay, Kelly <Kelly_Bay at brown.edu> wrote:

...

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abfriedman＠gmail.com

1:26 p.m.

Sorry for asking the stupid question then ;-)

...

From the vignette http://rss.acs.unt.edu/Rdoc/library/plm/doc/plmEN.pdf

it looks like pdata.frame() should exist and do what you want, but doesn't. The current documentation for plm functions don't seem to reference needing a specific pdata.frame, though, so it could be that they got rid of it in newer versions (although May 2007 is pretty recent). Maybe try an older version or play around with plm.data(), which claims, "This function transform a data frame in a format suitable for the use of the estimation functions of plm." Ari On Wed, Mar 12, 2008 at 1:09 PM, Dragojevic, Mila <Mila_Dragojevic at brown.edu> wrote:

...

_______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

jhainmueller＠gmail.com

3:12 p.m.

Kelly, Can you please paste the exact code you are trying to run? This will make it easier to figure out what is going on. Also can you run the examples given in the help-file? If so, it's worth looking at how your use of the function differs from that in the help file. Thanks, Jens

...

-----Original Message----- From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l- bounces at lists.fas.harvard.edu] On Behalf Of A Friedman Sent: Wednesday, March 12, 2008 1:27 PM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question Sorry for asking the stupid question then ;-)

From the vignette

http://rss.acs.unt.edu/Rdoc/library/plm/doc/plmEN.pdf it looks like pdata.frame() should exist and do what you want, but doesn't. The current documentation for plm functions don't seem to reference needing a specific pdata.frame, though, so it could be that they got rid of it in newer versions (although May 2007 is pretty recent). Maybe try an older version or play around with plm.data(), which claims, "This function transform a data frame in a format suitable for the use of the estimation functions of plm." Ari On Wed, Mar 12, 2008 at 1:09 PM, Dragojevic, Mila <Mila_Dragojevic at brown.edu> wrote:

Thanks for your reply. Yes, we have loaded them with library(plm)... ________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of A

Friedman

Sent: Wed 3/12/2008 12:13 To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question You've installed the packages, but have you loaded them? You need

in each session of R, with library(plm).... Ari On Wed, Mar 12, 2008 at 11:39 AM, Bay, Kelly <Kelly_Bay at brown.edu>

wrote:

> We are new to R and are trying to use the pdata.frame command

within the PLM package (panel model estimation for mixed effect models). We receive this message: "Error: could not find function "pdata.frame"" even though we have installed the plm and Ecdat packages and libraries. If you could provide us with any suggestions on how to proceed, we would greatly appreciate it.

Best, Kelly, Mila and Maria Angelica _____________________________________ Kelly Bay Brown University Department of Political Science Kelly_Bay at brown.edu _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

_______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

bevan＠fas.harvard.edu

6:43 p.m.

You need to make sure that you are running R version at least 2.6.1, otherwise the pdata.frame command won't work. Try ?pdata.frame after loading the plm package and see if anything comes up.

...

From the vignette

Thanks for your reply. Yes, we have loaded them with library(plm)... ________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of A

Friedman

Sent: Wed 3/12/2008 12:13 To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question You've installed the packages, but have you loaded them? You need

in each session of R, with library(plm).... Ari On Wed, Mar 12, 2008 at 11:39 AM, Bay, Kelly <Kelly_Bay at brown.edu>

wrote:

> We are new to R and are trying to use the pdata.frame command

_______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

-- Graduate Student Department of Government Harvard University Cambridge, MA

Kelly_Bay＠brown.edu

8:39 p.m.

Thanks for your responses, Ari, Jens and Oliver. We have R version 2.6.2 and loaded the plm package after that but we still receive the same message:

...

pdata.frame(dat, "country", "year", "pdat")

Error: could not find function "pdata.frame" When we try to see the help file we receive the following message:

...

?pdata.frame

No documentation for 'pdata.frame' in specified packages and libraries: you could try 'help.search("pdata.frame")' and then...

...

help.search("pdata.frame")

No help files found with alias or concept or title matching 'pdata.frame' using regular expression matching. I guess we should try playing around with the plm.data( ) function that Ari suggested. That actually does come up in the help file. We'll try that before bugging the group again. Thanks! _____________________________________ Kelly Bay Brown University Department of Political Science Kelly_Bay at brown.edu ________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of Oliver Craig Bevan Sent: Wed 3/12/2008 6:43 PM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question You need to make sure that you are running R version at least 2.6.1, otherwise the pdata.frame command won't work. Try ?pdata.frame after loading the plm package and see if anything comes up.

...

From the vignette

Thanks for your reply. Yes, we have loaded them with library(plm)... ________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of A

Friedman

Sent: Wed 3/12/2008 12:13 To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Replication question You've installed the packages, but have you loaded them? You need

in each session of R, with library(plm).... Ari On Wed, Mar 12, 2008 at 11:39 AM, Bay, Kelly <Kelly_Bay at brown.edu>

wrote:

> We are new to R and are trying to use the pdata.frame command

_______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

-- Graduate Student Department of Government Harvard University Cambridge, MA _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

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abfriedman＠gmail.com
bevan＠fas.harvard.edu
jhainmueller＠gmail.com
Kelly_Bay＠brown.edu
Mila_Dragojevic＠brown.edu