Hi R-friends

How can I adjust a sigmondal shaped regression in R?
My data looks like

x<-c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16)
y<-c(10,11,11,14,15,35,42,49,80,120,130,138,149,150,151,150)
plot(y~x)
modlin<-glm(y~x)
yest<-predict(modlin)
lines(yest~x)

thanks a lot

Miltinho 
Brazil

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