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dbs
2002 Jul 11
1
nls() singular graident matrix error
R-helpers;
I used Proc Model in SAS to fit the following model to data:
proc model data = dbsmv;
a = a1*F**2;
b = b1*F + b2*T + b3*F*T;
tph2 = tph1 *((1 - exp(-a*age2)) / (1 -
exp(-a*age)))**-b;
fit tph2;
and yielded the following estimated parameters after iterations:
a1 = -0.15943, a2 = -1.8177, b1 = -0.01911, b2...