/usr/share/gretl/scripts/ps3-6.inp is in gretl-common 2016a-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # PS3.6 for application section 3.11
open data3-3
ols PATENTS const R_D
# save residuals
genr ut = $uhat
# compute fitted values
genr temp = PATENTS - ut
# round to one decimal
genr fitted =int(0.5+(10*temp))/10
# compute forecast error
genr error = PATENTS - fitted
# compute absolute % error
genr abspcerr = int(0.5+(10000*abs(error)/PATENTS))/100
# print values; see Table 3.5
print -o R_D PATENTS fitted error abspcerr
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