Gupta and Das [2000] performed an experiment to improve the resistivity of a urea formaldehyde resin. The factors were amount of sodium hydroxide, \(A\), reflux time, \(B\), solvent distillate, \(C\), phthalic anhydride, \(D\), water collection time, \(E\), and solvent distillate collection time, \(F\). The data follow, where \(y_{1}\) is the resistivity from the first replicate of the experiment and \(y_{2}\) is the resistivity from the second replicate. Assume a gamma distribution. Use both the canonical and the log link to analyze these data. Perform appropriate residual analysis of your final models.

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A B C D E F Y2 TT TT 1 TT 60 135 -1 220 160 0 -1 1 1 85 180 0 1 1 1 330 110 0 1 1 1 95 130 0 1 1 190 175 145 200 1 1 -1 1 1 300 210 1 -1 1 1 -1 1 110 100