Add the 'brent-newton' optimizer to the shifted Gompertz MLE.
- Add the
'brent-newton'
optimizer to the shifted Gompertz MLE. This optimizer optimizesb
for a giveneta
using Newton-Raphson and on the above hierachy optimizeseta
using Brent's method. - Add the
'powell'
optimizer to the shifted Gompertz MLE. - Change the order of
eta
andb
parameters in shifted Gompertz MLE