/usr/share/gretl/scripts/ps6-12.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 16 17 18 19 20 21 22 | # PS6.12 for Ramsey's RESET test - Example 6.9
open data6-1
ols UNITCOST const OUTPUT INPCOST
# generate estimated Y and its powers
genr yhat1 = UNITCOST-$uhat
genr yhat2 = yhat1*yhat1
genr yhat3 = yhat1*yhat2
genr yhat4 = yhat2*yhat2
list
# estimated model with new variables
ols UNITCOST const OUTPUT INPCOST yhat2 yhat3 yhat4
omit yhat2 yhat3 yhat4
# Repeat example with the square of OUTPUT added to the model
square OUTPUT
ols UNITCOST const OUTPUT INPCOST sq_OUTPUT
genr yhat5 = UNITCOST-$uhat
genr yhat6 = yhat5*yhat5
genr yhat7 = yhat5*yhat6
genr yhat8 = yhat6*yhat6
list
ols UNITCOST const OUTPUT INPCOST sq_OUTPUT yhat6 yhat7 yhat8
omit yhat6 yhat7 yhat8
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