Matrix Elements VB-800 Manual do Utilizador Página 111

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A4.6 Some large projects 103
A4.6.1 DPD98 for Gauss
Download and install DPD from www.ifs.org.uk/econometindex.shtml (for ex-
ample in ox/packages/DPD98 for Gauss).
2
DPD stands for dynamic panel data.
Rename file The main file is dpd98.run, so rename that to dpd98.oxgauss to get
syntax highlighting and the GiveWin Run button. Windows users using Ox Profes-
sional may note that now it can be run directly from the Explorer window by clicking
on the file.
Fix for OxGauss syntax There are several warnings that ‘dot part of number, not dot
operator’, which happens when writing for example: 1.*x. It is safer to insert some
spacing or a 0. There are also two errors:
dpd98.prg (411): ’gauss::fms’ undeclared identifier
dpd98.prg (412): ’gauss::obs’ undeclared identifier
If you are in GiveWin or OxEdit, jump to these errors by double-clicking on the first.
The lines
fms=fms+mul;
obs=obs+n;
are problematic because fms and obs are used on the right-hand side before they exist.
This is quickly fixed by inserting:
fms=0;
obs=0;
at the top of dpd98.oxgauss.
Convert data files Running the modified program gives twice the ‘Invalid .FMT or
.DAT file’ error message, before falling over an array indexing problem (note that in-
dexing errors are always reported with element 0 the first element, which is the Ox
convention). The reason is that old style data sets (v89 .dht/.dat) must be converted
to the new format (v96 .dat). The program to do this conversion is ox/lib/dht2dat.
The conversion can be run from the command line as:
oxl lib/dht2dat auxdata.dht auxdata1.dat
oxl lib/dht2dat xdata.dht xdata1.dat
Now dpd98.oxgauss must be adjusted to use auxdata1 and xdata1 (in the open
commands).
Running the program As a final change set bat to one:
@ Set bat=1 to use in batch mode @ bat=1;
and the program, which is more than 2000 lines, will run successfully.
2
PcGive also incorporates DPD for panel data estimation. And there a DPD package for
Ox, which can also be used interactively with Ox Professional. Therefore, there is no reason to
attempt to call DPD98 from Ox.
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