I need to read a data set that has multiple observations per person (like scanner panel data). I want to use optim and compute the objective function person by person where each person has multiple observations (as in latent class models a la Kamakura and Russell (JMR, 1989))? I tried to use the (for) function but could not get it to do "Do loops" like in GAUSS or FORTRAN. Even if you have components of the program I am looking for, it could help. If so, would you send it to me at fusungo...@hotmail.com? Thank you.
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