Good morning everyone, 
I am looking for a package in R cran to fit a double logistic curve like
this: 
http://en.wikipedia.org/wiki/File:Dsigmoid.png
but the packages I've found are not running for my data, in particular: 
"phenex" package is specifical for NDVI data, 
"FlexParamCurve" is really interesting but it seems that id does not allow
this specifical fitting. 

Could someone give me some advices? 
Thank you a lot! 





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