Question: C10.6 Use the data in FERTIL3.RAW for this exercise. (i) Regress gfr, on t and t and save the residuals. This gives a detrended gfr,

C10.6 Use the data in FERTIL3.RAW for this exercise. (i) Regress gfr, on t and t and save the residuals. This gives a detrended gfr, say, gf (ii) Regress gf, on all of the variables in equation (10.35), including t and t. Compare the R-squared with that from (10.35). What do you con- clude? (iii) Reestimate equation (10.35) but add 13 to the equation. Is this additional term statistically significant?

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