in both cases, you have only one free parameter and you need to redefine the second one as a function of the first one. You should do that at the beginning of the “model” section and you must put a # sign at the beginning of the line (in order to differenciate this definition from a model equation)

f = h_1(d,e)

where h_1() is the inverse function, expressing f as a function of d and e. Again, you estimate e, but not f

in both cases, you have only one free parameter and you need to redefine the second one as a function of the first one. You should do that at the beginning of the “model” section and you must put a # sign at the beginning of the line (in order to differenciate this definition from a model equation)

b= c - a

and you don’t estimate b, only a

f = h_1(d,e)

where h_1() is the inverse function, expressing f as a function of d and e. Again, you estimate e, but not f

Dear Michel,
I don’t understand what is going on. I write a+b+c strictly less than 1 and the message appears as a+b+c equal to zero. Perhaps the inequality sign is interpreted as a html character…