Displaying 2 results from an estimated 2 matches for "modpoplar".
2011 Aug 18
2
what characteristics of model curve do parameters denote
...t,
I'm trying to fit a chapman-richards equation to my data, only I
cannot interpret the parameters a, b and d. I know that the parameter
b denotes the asymptote, but for the others I couldn't figure out. But
I do need to know this in order to set my starting values. Here's the
model:
modPoplar<- nls(Diameter ~ d*(1-exp(-b *Age))^a ,start=list(a=20,b=0.9,d=33))
I attached the graph, too.
Hoping for your answers!
Best, Anna
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2011 Aug 17
1
Interpreting parameters of sigmoid fct
...t,
I'm trying to fit a chapman-richards equation to my data, only I
cannot interpret the parameters a, b and d. I know that the parameter
b denotes the asymptote, but for the others I couldn't figure out. But
I do need to know this in order to set my starting values. Here's the
model:
modPoplar<- nls(Diameter ~ d*(1-exp(-b *Age))^a ,start=list(a=20,b=0.9,d=33))
I attached the graph, too.
Hoping for your answers!
Best, Anna
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