Allin,
Thanks for the clarifications. One thing though -- if I change the data
structure to stacked cross sections, the data get re-organized as expected. But
if I then say it's stacked cross sections a second time, the second
re-organization doesn't restore the original stacked time series.
Here's a sample of the data:
1) original (correct) stacked time series:
Argentina 14244.71
Argentina 12275.32
Argentina 11118.07
Argentina 13661.23
Argentina 14503.41
Argentina 15670.38
Australia 22988.74
Australia 24901.34
Australia 26079.21
Australia 29283.26
Australia 33732.40
Australia 38077.99
Austria 23277.40
Austria 24792.66
Austria 28504.44
Austria 30264.96
Austria 34459.28
Austria 36360.78
2) after applying stacked cross-sections:
Argentina 14244.71
Colombia 8057.55
Greece 19121.09
Korea, Republic 18670.63
Pakistan 2273.91
Sri Lanka 4455.84
Argentina 12275.32
Colombia 7888.27
Greece 18317.34
Korea, Republic 20788.10
Pakistan 2673.16
Sri Lanka 5290.79
Argentina 11118.07
Colombia 8416.99
Greece 18804.01
Korea, Republic 24389.44
Pakistan 3102.81
Sri Lanka 6081.70
Argentina 13661.23
3) after 2nd application of stacked cross-sections:
Argentina 14244.71
Malawi 1255.76
Belgium 22800.87
Mexico 12464.08
Burkina Faso 1218.20
Nicaragua 2595.55
Colombia 8057.55
Paraguay 6163.80
Denmark 33573.49
Rwanda 1351.55
El Salvador 6470.20
South Africa 9856.35
Greece 19121.09
Syria 2878.26
Indonesia 3094.67
Turkey 7561.41
Jamaica 9418.74
Venezuela 13117.04
Korea, Republic 18670.63
PS
-----Original Message-----
From: gretl-users-bounces(a)lists.wfu.edu
[mailto:gretl-users-bounces(a)lists.wfu.edu] On Behalf Of Allin Cottrell
Sent: Thursday, February 10, 2011 9:19 PM
To: Gretl list
Subject: Re: [Gretl-users] changing panel data structure
On Thu, 10 Feb 2011, Summers, Peter wrote:
> While helping a student sort out a dynamic panel estimation, I
> discovered the following. If I take a data set that's organized
> as stacked time series, change the structure to stacked
> cross-sections, then change it back, the second change isn't
> implemented. I get a box saying no changes were made. Is this
> intended behavior?
Ah, maybe it's a bit confusing but in fact it is intended. The
main point is that a panel dataset _must_ be organized as stacked
time series for use in gretl. "Stacked cross sections" is not an
option for panel data in gretl, it's just a way of saying that
your data are currently the wrong way round and need to be fixed.
So, if you go to "/Data/Dataset structure" and say that your
dataset is stacked cross sections, gretl will reorganize it for
you as stacked time series (a "physical" reorganization of the
data). Note that if you then go back to the "Dataset structure"
dialog your data will initially appear as "Stacked time series",
so, naturally, stating that the structure is stacked time series
will produce no change.
If you want to change the actual data layout back to what it was
originally, you have to say that it's stacked cross sections
(again), and gretl will reorganize the data in the opposite
direction.
Allin Cottrell
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