Another option is to launch the analysis in "invisible" mode and then query the report for the values you want to extract using display box subscripting:
biv = Bivariate( Y( :weight ), X( :height ), Fit Polynomial(2), Invisible);
rep = Report(biv);
//all = rep["Parameter Estimates"][TableBox(1)] <<Get As Matrix;
pe = rep["Parameter Estimates"][Number Col Box("Estimate")] <<Get As Matrix;
biv << Close();
show(pe);