/usr/share/gretl/scripts/ps5-3.inp is in gretl-common 1.9.14-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # PS5.3, for the per capita housing model
open data4-3
genr pchouse = housing/pop
genr pcgnp = gnp/pop
corr pcgnp unemp intrate
ols pchouse 0 pcgnp unemp intrate
omit unemp
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