/usr/share/gretl/scripts/ps8-1.inp is in gretl-common 1.9.14-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # PS8.1, for Examples 8.1 and 8.2
open data3-11
genr LNSALARY=ln(SALARY)
# Figure 8.2 and Example 8.1
textplot LNSALARY YEARS
genr YRS2 = YEARS*YEARS
# estimate basic log quadratic model for Example 8.2
ols LNSALARY const YEARS YRS2
# save uhat squared and predicted LNSALARY
genr usq=$uhat*$uhat
# genr predicted LNSALARY as actual minus residual stored as uhat
genr yhat1=LNSALARY-$uhat
# graph estimated residual variance against YEARS and yhat
textplot usq YEARS
textplot usq yhat1
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