finding parameters for Gompertz equation with package SSGompertz and fitting parameters to Gompertz equation

[Carlos Jorge Carvalho]

Greetings,

 

 

I am new around here and I am new to R. I learned to use R on my own from the internet. I have previous experience using Genstat.

 

 I have a set of data where I measured the growth of citrus fruits from fruit set to fruit picking. The x values are "days" and the y values are "diameter in milimetres" From the literature, the Gompertz curve seems to  describe well citrus fruit growth. I took my data and fitted to the SSGompertz package. Parameter estimation seem to be O.K. but I do not know how to build the Gompertz function from these parameters. I tried several combinations of the values and something is wrong. Y "diameter" values reach the asymptote within very few x "days" values. I leave you here the R output of my statistical test. I have two questions, if you ladies and gentleman can help me, first, if I made my statistical test correctly and second, how do I apply the parameters that I estimated to the gompertz function to get a model that will describe how my fruits grow.

 

 

Thank you very much in advance for your help 

[Jonathan Rosenblatt]

Dear Carlos-

Welcome to the list.

I am afraid your question might be a bit too Gomprez-specific for this list.

Jonathan 

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Jonathan Rosenblatt
www.john-ros.com