Statistical analyses
A second-order polynomial equation was
used to fit the experimental data given in Table 1.
The model proposed for the response (Y) was
Y = b0 + b1 x1 + b2x2+ b11x1
2 +b22x2
2 +
b12 x2x2 + e (1)
where Ywas the predicted response for yield, TSS,
RSS, clarity (%T670) and browning index (A420),
b0 (constant term) b1 and b2 (linear effects) b11 and
b22 (quadratic effects) and b12 (interaction effects)
and